Shugart SA800 Floppy OEM Manual
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SA800/801
Diskette
Storage Drive
~ . Shugart
TABLE OF CONTENTS
1.0 Introduction
1.1 General Description
1.2 Specification Summary
1.2.1 Performance Specifications
1.2.2 Functional Specifications
1.2.3 Physical Specifications
1.2.4 Reliability Specifications
2.0 Functional Characteristics
2.1 General Operation
2.2 Read/Write and Control Electronics
2.3 Drive Mechanism
2.4 Positioning Mechanism
2.5 Read/Write Head
2.6 Recording Format
2.7 Optional Features
2.8 Model Differences
3.0 Functional Operations
3.1 Power Sequencing
3.2 Drive Selection
3.3 Track Accessing
3.3.1 Step Out
3.3.2 Step In
3.4 Read Operation
3.5 Write Operation
3.6 Sequence of Events
'
4.0 Electric~llnterface
4.1 Signal Interface .. ,
4.1.1 Input Lines
4.1.1 Input Line Termination
4.1.1.2 Drive Select 1-4
4.1.1.3 Direction Select
4.1 .1 .4 Step ,
4.1 .1 .5 Write Gate
,
4.1.1.6 Write Data
, . , .. ,
4.1.1.7 Head Load (Alternate Input)
4.1.1.8 In Use (Alternate Input) .. , .. , . ,
4.1.2 Output Lines
4.1.2.1 Track 00
4.1.2.2 Index
4.1 .2.3 Sector (SA801 only)
4.1 .2.4 Ready
4.1 .2.5 Read Data
4.1 .2.6 Sep Data
4.1.2.7 Sep Clock
4.1.2.8 Write Protect (Optional on SA800)
4.1.2.9 Disk Change (Alternate Output)
4.1 .3 Alternate I/O Pins
4.2 Power Interface
4.2.1 AC Power
4.2.2 DC Power
'
,
, .. , , .. ,
,
,
,
,,
,
,.,
,,
,.,
'.'
'.'
,
'
1
1
2
2
2
2
3
5
5
5
5
5
5
6
6
6
7
7
7
7
7
7
7
9
9
13
, 13
13
15
15
15
15
15
16
16
16
16
16
16
17
17
17
17
17
17
18
18
18
18
19
5.0 Physical Interface
:21
5.1 J1/P1 Connector
:21
5.2 J5/P5 Connector
:22
5.3 J4/P4 Connector
:22
6.0 Drive Physical Specifications
:23
6.1 Drive Dimensions
:23
6.2 Mounting Recommendations
:23
6.2 . 1 Vertical Mounting
:23
6.2,,3 Upright Mounting "
'
:23
6.3 Chassis Slide
:25
6.4 Decorative Face Plate
:25
7.0 Customerlnstallable Options
:27
7.1 0 rive Select - One to Eight Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . :30
7.2 Select Drive Without Loading Head or Enabling Stepper Motor
:31
7.3 Select Drive and Enable Stepper Without L.oading Head
:32
7.4 Load Head Without Selecting Drive or Enabling Stepper
:32
7.5 Radial Ready
'
33
7.6 Radiallndex/Sector
34
7.7 Eight, 16, Or 32 Sectors
35
7.8 In Use Alternate Input (Activity LED)
:36
7.9 Write Protect Optional Use
36
7.10 Disk Change (Alternate Output)
'
37
8.0 Operation Procedures
38
8.1 Diskette Loading and Handling
38
8.2 Write Protecting a Diskette . '
39
9.0 Error Detection and Correction
'
40
9.1 Write Error
40
9.2 Read Error
40
Appendix A - Models and Features . '.'
41
ii
LIST OF ILLUSTRATIONS
Figure 1. SA800/801 Diskette Storage Drive . . . . . . . . . . . . . . . . . . . . . . . .
. iv
2. SA800/801 Functional Diagram . . . . . . . . . . . . . . . . . . . . . . . . .
4
3. Track Access Timing
..8
4. Read Initiate Timing . . . . . . . . . . . . . . . . . . . . . . . . .
.
8
5. Read Signal Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
9
6. Write Initiate Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . 10
7. Write Data Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . .
........
.
10
8. General Control and Data Timing Requirements . . . . . . . . . . . . . . . . . . . . . . . .
.
11
9. Interface Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. .. 14
10. Interface Signal Driver/Receiver . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . .
. . . . . . .. . .... 16
11. Index Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.......
. .. 16
17
12. Sector Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
13. J1 Connector Dimensions
.
21
14. J5 Connector
. . 22
15. J4 Connector
.
22
. . 22
16. Interface Connectors - Physical Location Diagram . . . . . . . . . . . . . . . . . . . . .. .
17. Head Load Actuator Mounting Prerequisites. . . . . . . . . . . . . . . . . . . . . . . .
. .. 23
18. SA800/801 Diskette Storage Drive Dimensions
24
19. Slide Mounting Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . 25
20. SA800/801 R Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26
28
21. Component Locations Standard PCB
,
,...........................
.
29
22. Component Locations LSI PCB
23. Drive Select Circuitry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . .
. . 30
. . 31
24. Select Drive Without Loading Head Circuit
25. Stepper Motor Enable Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . .. .. 32
26. Load Head Without Selecting Drive or Enabling Stepper Circuit . . . . . . . . . . . . . . . . .
33
27. Radial Ready Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. ... 34
28. Radial Index/Sector Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
34
29. Sector Timing Relationships. . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
35
35
30. Sector Divide Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
31. In Use/Activity LED Circuit
36
32. Write Protect Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 36
33. Disk Change Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . 37
34. Disk Change Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 37
35. Loading SA800/801 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
...........
.
38
36. Diskette Write Protected
.
39
37. Write Inhibit Notch Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
39
iii
SR800
Figure 1. SASOO/S01 Diskette Storage Drive
iv
1.0 INTRODUCTION
1.1 General Description
The SA800/80l are enhanced versions of the successful SA900/901 Diskette Storage Drive. The SA800/801
provides the customer with a mature and reliable product, manufactured to the same high standard of excellence as the 900/901, but with additional featuress.
The SA800 Diskette Storage Drive can read and write diskettes for interchange with other SA800's, the
SA900, IBM 3741,3742 or 3540 and with the IBM System 32.
The SA801 provides the same features as the SA800 with additional flexibility for those requirements which
preclude IBM compatibility.
The SA800/801 Diskette Storage Drives have as standard features: a patented diskette clamping/registration design which eliminates the possibility of damage to the diskette due to misregistration and quarantees
over 30,000 interchanges with each diskette; single and double density capability on the same drive for the
same price; a proprietary ceramic R/W head designed and manufactured by Shugart Associates to provide
media life exceeding 3.5 million passes/track and head life exceeding 15,000 hours; an activity light which
indicates drive in use; and ribbon cable or twisted pair connector for ease of packaging. All of these features
and more are available with the SA800/801.
SA800/801 Diskette Storage Drive provide the system designer solutions to his applications requirements
with greater performance and reliability than cassette or cartridge drives, and lower cost with increased
function over I/O and reel-to-reel tape drives.
Applications for the SA800/801 Diskette Storage Drive are key entry systems, point of sale recording
systems, batch terminal data storage microprogram load and error logging, minicomputer program and auxiliary data storage, word processing systems and data storage for small business systems.
The SA100 Diskette, IBM Diskette or equivalent, can be read and written interchangeably between any
SA800 and IBM 3741/42, 3747 and 3540. The SA101 Diskette can be read or written interchangeably on any
SA801. The SA102 and SA103 are used for double density applications.
As a product enhancement, to improve reliability and serviceability, Shugart is incorporating into the SABOO
serves drives a PCB Large Scale Integration (LSI) components. These components are:
• Control Chip
• Write Channel
• Read Channel
The LSI Control chip performs the following functions:
•
•
•
•
•
•
•
•
•
TRK 00 detector
Index detector
Stepper logic
FM clock/data separator and data window
Sector separator
Write Protect detector
Door open/close detector
Disk change circuit
Ready signal
The functions listed above are either detected from the drive mechanics or from the Host Interface. As a
result, the proper logic generated by the LSI chip either will be used within the drive electronic circuit to perform stepping, read/write operations or will be fed back to the Host Interface.
Also, an internal FM data separator is incorporated inside the chip. A jumper option will allow the user to
select the data separator to perform as its predecessor SABOO (jumper FS) or to select the separator to be
compatible with the IBM System 3740 data separator (jumper TS). Thus IBM compatibility will allow direct interfacing with LSI single chip floppy disk controllers.
1.2 Specification Summary
1.2.1 Performance Specifications
Capacity
Unformatted
Per Disk
Per Track
IBM Format
Per Disk
Per Track
Tranfer Rate
Latency (average)
Access Time
Track to Track
Average
Settling Time
Head Load Time
Single Density
Double Density
3.2 megabits
41 .7 kilobits
6.4 megabits
83.4 kilobits
2.0 megabits
26.6 kilobits
250 kilobits/sec.
83 ms
n/a
n/a
500 kilobits/sec
83 ms
8 ms
8 ms
260·ms
8 ms
35 ms
8 ms
260 ms
35 ms
1.2.2 Functional Specifications
Rotational Speed
Recording Density
(inside track)
Flux Density
Track Density
Tracks
Physical Sectors
SA800
SA801
Index
Encoding Method
Media Requirements
SA800
SA801
Single Density
360 rpm
Double Density
360 rpm
3200 bpi
6400 fci
48 tpi
77
6400 bpi
6400 fci
48 tpi
77
o
o
32/16/8
32/16/8
1
1
FM
MFM/M FM
SA100IIBM Diskette
SA101
SA10211BM Diskette
SA103 .
2
1.2.3 Physical Specifications
t
Operating
Enviromental Limits
= 40°F to 115°F (4.4° to 46.1 DC)
Ambient Temperature
= 20% to 80%
Relative Humidity
Maximum Wet Bulb
= 78°F (25°C) .
AC Power Requirements
50/60 Hz ± 0.5 Hz
100/115 VAC Installations = 85 to 127V @ .3A typical
200/230 VAC Installations = 170 to 253V @ .18A typical
DC Voltage Requirements
+ :24 VDC ± 5% 1.3A typical
+ 5 VDC ± 5% 0.8A typical
-5 VDC ±5 % .05A typical (option -7 to -16 VDC)
Mechanical Dimensions (Reference Figures 18 and 20)
Width
=
4 5/8 in. (11.75 cm)
9 1/2 in. (24.13 cm)
Height
Depth
-14 1/4 in. (36.20 cm)
Weight
= 13.0 Ibs. (5.91 kg)
Heat Dissipation = 271 BTU/hr. typical (80 Watts)
t Minus voltages are not required .tor SA800L.
2
Shipping
Storage
-40°F to 144°F
1 to 95%
No Condensation
-BoF to 117°F
1 to 95%
No Condensation
1.2.4 Reliability Specifications
MTBF:
5000 POH under heavy usage
8000 POH under typical usage
PM:
Every 5000 POH under heavy usage
Every 15,000 under typical usage
MTTR:
30 minutes
Component Ufe:
15,000 POH
Error Rates:
Soft Read Errors:
Hard Read Errors:
Seek Errors:
1 per 109 bits read
1 per 1012 bits read
1 per 106 seeks.
Media Ufe:
Passes Per Track
Insertions:
3.5 X 106
30,000 +
3
V'JR!TE PROTECT LED
WRITE PROTECT DETECTOR
~~
I"
READ DATA
SEP DATA
SEP CLOCK
READ
LOGIC
READ HEADI
I
I
DRIVE SELECT
"T1
cO"
...CD
-e
~
~
WRITE DATA
WRITE GATE
WRITE PROTECT (optional)
I
WRITE
LOGIC
WRITE HEAD
(J)
»
ex>
0
0
05
0
.....
11
C
::J
~
o·
::J
~
0
05"
<0
Q)
3
POWER ON
RESET
STEP
DIRECTION SELECT
DRIVE SELECT (4 LINES)
TRACK 00
INDEX
READY
SECTOR (SA801)
I
I
I
~~
,,~
L.-a
"~,
----
'~~/
l
~
INDEX
DETECTOR
/"~~
"~
I
DRIVE
SELECT
HEAD LOAD SOLENOID
CONTROL
LOGIC
(HEAD LOAD)
(IN USE)
(DiSK CHANGE)
ACTIVITY LIGHT ~~
TRACK 00 LED
.. ~
TRACK 00 DETECTOR
STEPPER 01
STEPPER 02
STEPPER 03
INDEX DETECTOR
INDEX LED
_ _ _~I
2.0 FUNCTIONAL CHARACTERISTICS
2.1 General Operation
The SA800/801 Diskette Storage Drive consists of read/write and controls electronics, drive mechanism,
read/write head, track positioning mechanism, and the removable diskette. These components perform the
following functions:
Interpret and generate control signals.
Move read/write head to the selected track.
Read and write data.
The relationship and interface signals for the. internal functions of the SA800/801 are shown in Figure 2.
The Head Positioning Actuator positions the read/write head to the desired track on the diskette. The Head
Load Actuator loads the diskette against the read/write head and data may then be recorded or read from
the diskette.
2.2 Read/Write and Control Electronics
The electronics are packaged on one PCB. The PCB contains:
1.
2.
3.
4.
5.
6.
7.
8.
Index Detector Circuits. (Sector/Index for 801).
Head Position Actuator Driver.
Head Load Actuator Driver.
Read/Write Amplifier and Transition Detector.
Data/Clocl< Separation Circuits.
Write Protect.
Drive Ready Detector Circuit.
Drive Select Circuits.
2.3 Drive Mechanism
The Diskette drive motor rotates the spindle at 360 rpm through a belt-drive system. 50 or 60 Hz power is accommodated by changing the drive pulley and belt. A registration hub, centered on the face of the spindle,
positions the Diskette. A clamp that moves in conjunction with the cartridge guide fixes the Diskette to the
registration hub.
2.4 Positioning Mechanism
An electrical stepping motor (Head Position Actuator) and lead screw positions the read/write head. The
stepping motor rotates the lead screw clockwise or counterclockwise in 15° increments. A 15° rotation of the
lead screw moves the read/write head one track position. The using system increments the stepping motor
to the desired track.
.
2.5 Read/Write Head
The SA800/801 head is a single element ceramic read/write head with straddle erase elements to provide
erased areas between data tracks. Thus normal interchange tolerances between media and drives will not
degrade the signal to noise ratio and insures Diskette interchangeability.
The read/write head is mounted on a carriage which is located on the Head Position Actuator lead screw.
The Diskette is held in a plane perpendicular to the read/write head by a platen located on the base casting.
This precise registration assures perfect compliance with the read/write head. The Diskette is loaded
against the head with a load pad actuated by the head load solenoid.
The read/write head is in direct contact with the Diskette. The head surface has been designed to obtain
maximum signal transfer to and from the magnetic surface of the Diskette with minimum head/Diskette
wear.
5
2.6 Recording Format
The format of the data recorded on the disk is totally a function of the host system, and can be designed
around the users application to best take advantage of the total available bits that can be written on anyone
track"
For a detailed discussion of various recording f:ormats, the systems designer should read one of the following:
.
1. IBM Compatibility Manual.
2. Shugart Associates Double Density Design Guide.
3. 8.A801/901 Track Formats.
2.7 Optional Features
t
1. -12 to -15 Volt DC to replace -5 Volt DC requirement.
2. Dust Cover, Not available on "R"series.
3. Write Protect for SA800. Standard on SA801 .
4. Door Lock. Will lock the door when drive is selected or through alternate I/O pin.
5. Horizontal mounting with door opening up.
6. SA800/801" R" Series. Allows two drives to be horizontally installed in a standard 19" Retrna rack. Reference figure 20.
2.8 Model Differences
800-1 800-2 800-4 801 -
Soft Sectored with an FM (single density) data separator.
Soft Sectored without data separator.
Mechanics only (No PCB).
Hard Sectored with an FM (single
density) data separator and sector
separator.
NOTE:
To convert a 801 to a 800 move the shorting plug from the 801 position to the 800 position. A
800 cannot be converted to a 801 .
t
Minus voltages are not required for SA800L.
6
3.0 FUNCTIONAL OPERATIONS
3.1 Power Sequencing
Applying AC and DC power to the SA800/801 can be done in any sequence, however, once AC power has
been applied, a 2 second delay must be introduced before any Read or Write operation is attempted. This
delay is for stabilization of the Diskette rotational speed. Also, after application of DC power, a 90 millisecond delay must be introduced before a Read, Write, or Seek opration or before the control output signals
are valid. After powering on, initial position of the R/W head with respect to data tracks is indeterminant. In
order to assure proper positioning of the R/W head prior to any read/write operation after powering on, a
Step Out operation should be performed until the Track 00 indicator becomes active.
3.2 Drive
Se~ection
Drive selection occurs when a drive's Drive Select line is activated. Only the drive with this line active will
respond to input lines or gate output lines. Under normal operation, the Drive Select line will load the R/W
head, apply power to the stepper motor, enable the input lines, activate the output lines and light the Activity
LED on the front of the drive. Optional modes of operation are available. Reference section 7 for these user
installable features.
3.3 Track Accessing
Seeking the R/W head from one track to another is accomplished by:
a.
b.
c.
d.
Activating Drive Select line.
Selecting desired direction utilizing Direction Select line.
Write Gate is being inactive.
Pulsing the Step line.
MUltiple track accessing is accomplished by repeated pUlsing of the Step line until the desired track has
been r~ached. Each pulse on the Step line will cause the R/W head to move one track either in or out depending on the Direction Select line. Head movement is initiated on the trailing edge of the Step Pulse.
3.3.1 Step Out
With the Direction Select line at a plus logic level (2.5V to 5.25V) a pulse on the Step line will cause the R/W
head to move one track away from the center of the disk. The pUlse(s) applied to the Step line and Direction
Select line must have the timing characterisitics shown in Figure 3.
3.3.2 Step In
With the Direction Select line at a minus logic level (OV to AV), a pulse on the Step line will cause the R/W
head to move one track closer to the center of the disk. The pulse(s) applied to the Step line must have the
timing characterisitics shown in Figure 3.
3.4 Read Operation
Reading data from the SA800/801 Diskette Storage drive is accomplished by:
a. Activating Drive Select line.
b. Write Gate being inactive.
The timing relationships required to initiate a read sequence are shown in Figure 4. These timing specifications are reqUired in order to guarantee that the R/W head position has stabilized prior to reading.
The timing of the read signals, Read Data, Separated Data, and Separated Clock are shown in Figure 5.
7
----------"s
s'------
DC POWER
DRIVE SELECT
L,--------'s
S,,-,- - - - -
REVERSE
DIRECTION SELECT
TRACK 00
OUTPUT SIGNAL
STEP
Figure 3. Track Access Timing
~~-----------"'~'--S - DC POWER
DRIVE SELECT
~----------~S'--STEP
U'-----"SS'\lo--I
WRITE GATE
VALID READ DATA-------!-----!----.....
~ 1~I~S
* 2 SECONDS IF AC AND DC POWER ARE APPLIED AT SAME TIME
Figure 4. Read Initiate Timing
8
l..- 200
I ± 50ns
READ DATA
SEP DATA
I
I
I
I
A
B
A
B
I
iJ
i
----I J.--
LJ
200 ± 50ns
SEP CLOCK
I
U-U-U
--....J
~ 200
u
± 50ns
A= LEADING EDGE OF BIT MAY BE ± 400 ns FROM ITS NOMINAL POSITION.
B = LEADING EDGE OF BIT MAY BE ± 200 ns FROM ITS NOMINAL POSITION.
Figure 5. Read Signal Timing
3.5 Write Operation
Writing data to the SA800/801 is accomplished by:
a. Activating the Drive Select line.
b. Activating the Write Gate line.
c. Pulsing the Write Data line with the data to be written.
The timing relationships required to initiate a write data sequence are shown in Figure 6. These timing
specifications are required in order to guarantee that the R/W head position has stabilized prior to writing.
The timing specifications for the Write Data pulses are shown in Figure 7.
3.6 Sequence of Events
The timing diagram shown in Figure 8 shows the necessary sequence of events with associated timing
rEJstrictions for proper operation.
9
DC POWER
_I
_
1---90MSM,N*i
DRIVE SELECT
,~_---=1.. 35MS~
STEP
--LI'~I--'-
---I
WRiTE GATE
r16MSMIN
---
-----I~
---I
----------------.
1--4.00/,8 MAX
WRITE DATA
.....- ...
* 2 SECONDS IF AC AND DC POWER ARE APPLIED AT SAME TIME.
Figure 6. Write Initiate Timing
. WRITE DATA
I 150 ns MIN
~ 11 OOns MAX
I..
Figure 7. Write Data Timing
10
.I..~
4.00JLs ± 20ns·
2.00JLs
± 10ns
--.J1'-"'..- -..-12-S-EC-M-N---------~5
S~-
AC POWER
--.Jr----il~----~SS.....-DC POWER
VAll D CONTROL
OUTPUT SIGNALS
~_90_M_S_M_IN
--j
~S S--.---
+1Il~----~SS~L·
500 NS MAX
DRIVE SELECT
DIRECTION SELECT
~
.. 41'8~.IN
~~~I:--11t-S·M - I N - - - - - - - " S s
_~_I
__~
U
90 MS
~~
11'8 MIN
l-ta
STEP
SS'r--MS MIN STEPPR ONLY
1---12lts MAX
TRACK 0
OUTPUT SIGNAL
.
I
s
S
H41'8
WRITE DATA
WRITE GATE
VALID READ
DATA SIGNAL
_~
1------..1-I.
1
S5~-L
35 MS MIN HEAD LOAD
~8_M_S
__
1_
.
NOTE 1:
I~
_.I
I I 90 MS MIN
-t
I 1O.4ItS MIN I
18 MS MIN
~
MAX
_-:flJUl
_MI.....
N 1__
..
35 MS MIN HEAD LOAD_
90 MS MIN
-
35ms minimum delay must be introduced after Drive Select to
allow for proper head load settling. If stepper power is to be applied independent of Head Load, than and 8ms minimum delay
must be introduced to allow for stepper settling..
General Control and Data Timing Requirements
11
~c 5
")
_ ~
50ItSMIN~
r
L
I
4.0 ELECTRICAL INTERFACE
The interface of the SA800/801 Diskette drive can be divided into two categories:
1. Signal
2. Power
The following sections provide the electrical definition for each line.
Reference Figure 9 for all interface connections.
4.1 Signal Interface
The signal interface consists of two categories:
1. Control
2. Data Transfer
All lines in the signal interface are digital in nature and either provide signals to the drive (input), or provide
signals to the host (output), via interface connector P1/J1.
4.1.1 Input Lines
There are ten signal input lines, eight are standard and two are user installable options (reference section 7).
The input signals are of two types, those intended to be multiplexed in a mUltiple drive system and those
which will perform the multiplexing. The input signals to be mUltiplexed are:
1. Direction Select
2. Step
3. Write Data
4. Write Gate
The input signals which are intended to do the mUltiplexing are:
1. Drive Select
2. Drive Select
3. DriveSelect
4. 0 rive Select
1
2
3
4
The input lines have the follOWing electrical specifications. Reference Figure 10 for the recommended circuit.
True = Logical zero = Vin ± O.OV to + O.4V
@Iin = 40 ma (max)
False = Logical one = Vin + 2.5V to + 5.25V
@Iin = 0 ma (open)
Input Impedence = 150 ohms
13
HOST SYSTEM
-
FLAT RIBBON OR
TWISTED PAIR
MAX 10 FEET
DISK CHANGE*
IN USE*
II.
HEAD LOAD*
INDEX
SA800/801
J1
12
---
15
16
--
11
17
18
19
20
~Il.
READY
SECTOR (801 ONLY)
-
26
DRIVE SELECT 2
-
28
DRIVE SELECT 3
-
30
DRIVE SELECT 4
DIRECTION SELECT
WRITE GATE
--
38
-
40
DCGND
--
+ 24 VDC
-
:I + 24 V RETURN
A~~D
NOTE:
ACINPUT
FRAME GROUND
ACINPUT
g
TWISTE.D PAIR
37 ..
39
41
43
45
47
48
49
50
J5
+5 VDC
-5 VDCj-7 to -16 VDC) t·
35 ..
46
SEP CLOCK
--
33 ..
44
SEP DATA
I
31
42
READ DATA
4.-
29 ..
36
WRITE PROTECT (OPTIONAL)_
I
27 ..
34
TRACK 00
-
25 ..
32
.~
WRITE DATA
23
24
DRIVE SELECT 1
STEP
21 ...
22
5
.-
4
-
1
6
3
2
";:o~
---
J4
1
~~
FRAME GND
Not shown are 5 of the 9 Alternate I/O connections. The connections for these lines are on
pins 2, 4, 6, 8, 10 and 14. Signal return for these lines are on pins 1, 3, 5, 7, 9 and 13 respectively. Reference SectionJ for uses of these lines.
*These lines are alternate input/output lines and they are enabled by jumper plugs. Reference
Section 7 for uses of these lines.
t
Minus voltages are not required for SA800L.
Figure 9. Interface Connections
14
4.1.1 Input Line Termination
The SA800/801 has been provided with the capability of terminating the four input lines, which are meant to
be mUltiplexed, by jumpering traces. The four lines and their respective jumpering traces are:
1. Direction Select
2. Step
3. Write Data
4. Write Gate
Trace
Trace
Trace
Trace
"T3"
"T4"
"T5"
"T6"
In order for the drive to function properiy, the last drive on the interface must have these four lines terminated. Termination of these four lines can be accomplished by either of two methods.
1. As shipped from the factory, jumpers are installed on the terminator posts T3, T4, T5, and T6. Remove
these shorting plugs from all drives except the last one on the Interface.
2. External termination may be used provided the terminator is beyond the last drive. Each of the four lines
should be terminated by using a150 ohm, 1A watt resistor, pulled up to + 5 VDC.
4.1.1.2 Drive Select 1-4
Drive Select when activated to a logical zero level, activates the multiplexed I/O lines and loads the R/W
head. In this mode of operation only the drive with this line active will respond to the input lines and gate the
output lines.
Four separate input lines, Drive Select 1, Drive Select 2, Drive Select 3, and Drive Select 4, are provided so
that up to four drives may be multiplexed together in a system and have separate Drive Select lines. Traces
'DS1', 'DS2', 'DS3', and 'DS4' have been providedto select which Drive Select line will activate the interface signals for a unique drive. As shipped from the factory, a shorting plug is installed on 'DS1'. To select
another Drive Select line, this plug should be moved to the appropriate 'OS' pin. For additional methods of
selecting drives, see section 7~ 1.
4.1.1.3 Direction Select
This interface line is a control signal which defines direction of motion the R/W head will take when the Step
line is pUlsed. An open circuit or logical one defines the direction as "out" and if a pulse is applied to the
Step line the R/W head will move away from the center of the disk. Conversely, if this input is shorted to
ground or a logical zero level, the direction
of motion is defined as "in" and if a pulse isapplied to the step line, the R/W head will move towards the
center of the disk.
4.1.1.4 Step
This interface line is a control signal which causes the R/W head to move with the direction of motion as
defined by the Direction Select line.
The access motion is initiated on each logical zero to logical one transition, or the trailing edge of the signal
pulse. Any change in the Direction Selectline must be made at least 1 p,s before the trailing edge of the Step
pulse. The read/write head may be prevented from stepping past track 00 by using the" NFO" trace option
on LSI PCB. Refer to Figure 3 for these timings. Note: When going from a reverse seek to a forward seek or
vice versa and additional 8 ms delay must be induced before changing direction.
4.1.1.5 Write Gate
The active state of this signal, or logical zero, enables Write Data to be written on the diskette. The inactive
state, or logical one, enables the read data logic (Separated Data, Separated Clock, and Read Data) and
stepper logic. Refer to Figure 6 for timings.
15
4.1.1.6 Write Data
This interface line provides the data to be written on the diskette. Each transition from a logical one level to a
logical zero level, will cause the current through the R/W head to be reversed thereby writing a data bit. Tl1is
line is enabled by Write Gate being active. Refer to Figure 7 for timings.
4.1.1.7 Head Load (Alternate Input)
This customer installable option, when enabled by jumpering Trace 'e' and activated to a logical zero level
and the diskette access door is closed, will load the R/W head load against the diskette. Refer to section 7
for USE~S and method of installation.
4.1.1.8 In Use (Alternate Input)
This customer installable option, when enabled by jumpering Trace '0' and activated to a logical zero level
will turn on the Activity LED in the door push button. This signal is an "OR" function with Drive Select. Refer
to section 7.8 for uses and method of installation.
4.1.2 Output Lines
There are six standard and one optional output
lines from the SA800, and eight output lines from
the SA801" Also, there is one Alternate Output
available from the drive. The output signals are
driven with an open collector output stage
capable of sinking a maximum of 40 ma at a
logical level or true state with a maximum
voltagl9 of O.4V measured at the driver. When the
line driver is off and the collector current is a
maximum of 250 microamperes.
Refer to Figure 10 for the recommended circuit.
MAX 10 FEET
RIBBON OR
TWISTED PAIR
>
-Figure 10. Interface Signal Driver/Receiver
4.1.2.1 Track 00
The active state of this signal, or a logical zero indicates when the drives R/W head is positioned at track
zero (the outermost track) and the access circuitry is driving current through phase one of the stepper
motor. This signal is at a logical one level, or false state, when the selected drives R/W Ilead is not at track
00.
4.1.2.2 Index
..
166.67 ± 3.33 MS I
This interface signal is provided by the drive
once each revolution of the diskette (166.67 ms)
to indicate the beginning of the track. Normally
this signal is a logical one and makes the transition to the logical zero level for a period of 1.7
ms (0.4 ms on SA801) once each revolution. The
timing for this signal is shown in Figure 11.
-u
To correctly detect Index at the Host Index
should be false at Drive Select time, that is, the
Host should see the transition from false to true
after the driV~ has been selected.
For additional methods of detecting Index, refer to section 7.6.
16
1
.-
SS
Lf
:=I
1.7 ± 5 MS
(0.4 ± .2 MS SA801)
Figure 11. Index Timing
r--
4.1.2.3 Sector (SA801 only)
This interface signal is provided by the drive 32 times each revolution. Normally, this signal is a logical one
and makes the transition to a logical zero for a period of 0.4 ms each time a sector hole on the Diskette is
detected. Figure 12 shows the timing of this signal and its relationship to the Index pulse.
For additional methods of detecting Sector refer to section 7.7.
SECTOR
INDEX
U
I- -1
U
I
~
5 .20 ± .30 MS
± .2 MS
S
U
SS
U
1--2.60 ± .50 MS
Figure 12. Sector Timing
4.1.2.4 Ready
This interface signal indicates that two index holes have been sensed after properly inserting a diskette and
closing the door,or that two index holes have been sensed following the application of + 5V power to the
drive.
For additional methods of using the Ready line, refer to section 7.5.
4.1.2.5 Read Data
This interface 1ine provides the" raw data" (clock and data together) as detected by the drive electronics.
Normally, this signal is a logical one level and becomes a logical zero level for the active state. Reference
Figure 5 for the timing and bit shift tolerance within normal media variations.
4.1.2.6 Sep Data
This interface line furnishes the data bits as separated from the "raw data" by use of the internal data
separator. Normally, this signal is a logical one level and becomes a logical zero level for the active state.
Reference Figure 5 for the timing. This line is available on the SA801 and 800 Model 1.
4.1.2.7 Sep Clock
This interface line furnishes the clock bits as separated from the "raw data" by use of the internal data
separator. Normally, this signal is a logical one level and becomes a logical zero level for the active state.
Reference Figure 5 for the timing. This line is available on the SA801 and 800 Model 1 and PCB 25136.
NOTE: True separation internally inserting up to three missing clock bits to maintain synchronization, is
available on the LSI PCB by using trace option' 'TS".
4.1.2.8 Write Protect (Optional on SA800)
This interface signal is provided by the drive to give the user an indication when a Write Protected Diskette is
installed. The signal is logical zero level when itis protected. Under normal operation, the drive will inhibit
writing with a protected diskette installed in addition of notifying the interface.
For other methods of using Write Protect, refer to section 7.9.
17
4.1.2,.9 Disk Change (Alternate Output)
Reference section 7.10.
4.1.3 Alternate 1/0 Pins
These interface pins have been provided for lise with customer installable options. Refer to section? for
methods of use.
4.2 Power Interface
The SA800/801 Diskette Storage Drive requires both AC and DC power for operation. The AC power is used
for the spindle drive motor and the DC power is used for the electronics and the stepper motor.
4.2.1 AC Power
The AC power to the drive is via the connector P4/J4 located to the rear of the drive and below the AC motor
capacitor. The P4/J4 pin designations are outlined below for standard as well as optional AC power.
P4
PIN
50 Hz
60 Hz
115 V (Standard)
1
85-127 VAC
2
208/230 V
110V
220V
170··253 VAC
85-127 VAC
170-253 VAC
"Frame Gnd
Frame Gnd
Frame Gnd
Frame Gnd
3
85-127 V Rtn
170··253 V Rtn
85-127 V Rtn
170-253 V Rtn
MAX
0.35 Amps
0.:23 Amps
0.35 Amps
0.23 Amps
CURRENT
FREQ
TOLERANCE
±0.5 Hz
18
±0.5 Hz
4.2.2 DC Power
DC power to the drive is via connector P5/J5 located on non-component side of PCB near the P4 connector.
The' three DC voltages and their specifications along with their P5/J5 pin designators, are outlined below.
P5
PIN
DC VOLTAGE
TOLERANCE
1
+24 VDC
± 1.2 VDC
1.7 A Max**
1.3 A Typ
100 mv
2
+ 24 V Return*
3
- 5 V Return
±0.25 VDC
0.07 A Max
0.05 A Typ
50 mv
NA
0.10 A Max
0.07 A Typ
NA
±0.25 VDC
1.0 A Max
0.8 A Typ
50 mv
- 5 VDC
t4
CURRENT
MAX
RIPPLE (p to p)
1-0--------- -------_ .... --------- --------_.
Optional
-7 to -16 VDC
(trace "L')***
+
5
6
+
5 VDC
5 V Return.
*,The + 24 VDC power requires a separate
ground return line. It, and all other DC grounds
must be connected together at the· power supply. One line from this common DC connection
must go to one common Frame Ground connection near the power supply.
* * If either customer installable option described
in sections 7.2 and 7.4 are used, the current requirementforthe + 24 VDC is a mUltiple of the
maximum of + 24V current times the number of
drives on the line.
* * * If the shorting plug is in the vertical position
the -7 to -16 VDC option can be used. If the shorting plug is in the horizontal position, -5 VDC
must be used.
t Minus voltages are not required for SA800L.
19
5.0 PHYSICAL IN'TERFACE
The electrical interface between the SA800/801 and the host system is via three connectors. The first connector, J1, provides the signal interface; the second connector, J5, provides the DC power; and the third
conector, J4, provides the AC power and frame ground.
This section describes the physical connectors used on the drive and the recommended connectors to be
used with them. Refer to Figure 16 for connector locations.
5.1 J1/P1 Connector
Connection to J1 is through a 50 pin PCB edge card connector. The dimensions for this connector are shown
in Figure 13. The pins are numbered 1 through 50 with the even numbered pins on the component side of the
PCB and the odd numbered pins on the non-component side. Pin 2 is located on the end of the PCB connector closest to the AC motor capacitor and is labeled 2. A key slot is provided between pins 4 and 6 for optional connector keying.
The recommended connectors for P1 are tabulated below.
TYPE OF CABLE
MANUFACTURER
CONNECTOR PIN
CONTACT PIN
Twisted Pai r, #26
(crimp or solder)
AMP
1-583717-1
583616-5 (crimp)
58354-3 (solder)
Twisted Pai r, #26
(solder term.)
VIKING
3VH25/1 IN-5
NA
Flat Cable
3M "Scotchflex"
3415-0001
NA
KEY SLOT
---J r--
.036 ± .004"
,N~"~--l
.400 ± .010"
~~'I~
II
.450 ± .010"
_L.. . . ~~ . . ..&.....I-4-~_
II --l f--
~
1--.050" NOM
oL()
~-&--'--~~
1 --,+1
....
'II
---&.....
--l
.050" NOM
.100" NOM-
~~~3;~X)
-
..._ - - - - - - - - - - . - 2 . 5 7 5 ± . 0 1 0 " - - - - - - - - -........
BOARD THICKNESS .062 ± .001"
Figure 13. J1 Connector Dimensions
21
5.2 J5/P5 Connector
CD 0
The DC power connector, J5, is mounted on the
non-component side of the PCB and is located
below the AC motor capacitor. J5 is a 6 pin AMP
Mate-N-Lok connector PIN 1-380999-0. The
recommended mating connector (P5) is AMP
PIN 1-480270-0 utilizing AMP pins PIN 60619-1.
J5 p~ns are labeled on the component side of the
PCB with pin 5 located nearest J1/P1. Figure 14
illustrates J5 connector as seen on the drive
PCB from non-component side.
0~
CD
® CD
Figure 14. J5 Connector
5.3 J4/P4 Connector
The AC. power connector, J4 is mounted on Ule
AC motor capacitor bracket and is located just
below the capacitor. J4 connector is a 3 pin connector AMP PIN 1-480305-0 with pins PiN
606~~o-1. The recommended mating connector
(P4) is AMP PIN 1-480303-0 or 1-480304-0 both
utilizing pins PIN 60619-1. Figure 15 illustrates
J4 connector as seen from the rear of the drive.
1(0
CD
0]
Figure 15. J4 Connector
AC DRIVE MOTOR CAPACITOR
REAR OF DRIVE - - - 4.....
J5 AM P PIN 1-380999-0
J4AMPP/N
1-480305-0~
. . . -. . . . ...
<...
P4/
AMP PIN 1-480303-0
AMP PIN 1-480304-0
'"'-./..
<'"
DRIVE PCB
/~>
J1
P5
AMP PIN 1-480270-0
P1 CONNECTOR
FLAT CABLE
3M PIN 3415-0001
TWISTED PAIR
AMP PIN 1-583717-1
VIKING PIN 3VH25/1 IN-5
Figure 16. Interface Connectors - Physical Location Diagram
22
6.0 DRIVE PHYSICAL SPECIFICATIONS
This section describes the mechanical dimensions and mounting recommendations for the SA800/801.
6.1 Drive Dimensions
Reference Figure 18for dimensions of the SA800/801.
6.2 Mounting Recommendations
The SA800/801 is capable of being mounted in one of the following positions:
1. Vertical-Door opening to the left or right.
2. Horizontal-Door opening up or down.
3. Upright-Door opening towards the frqnt or rear.
6.2.1 Vertical Mounting
The drive, as shipped from the factory, is ready to be mounted in the vertical position, door opening left or
right, without any adjustments.
Horizontal Mounting
If the drive is to be mounted horizontally with the
door opening down (PCB up), the head load actuator return spring must be repositioned to
compensate for gravity. Reference Figure 17 for
the proper spring position on the actuator.
HORIZONTAL
MOUNTING
(PCB UP)
If the door is to open up (PCB down), it must be
specified when ordering. This feature provides a
heavier door opening spring. In addition, the
head load actuator return spring will be repositioned to compensate for gravity. Reference
Figure 17 for the proper position for the spring
on the actuator.
Figure 17. Head Load Actuator Mounting Prerequisites
6.2.3 Upright Mounting
If the Drive is to be mounted in the upright position (IBM 3740 fashion), the spring hook attached to the eject
mechanism must be removed and then attach the eject spring to the place the hook was on.
23
~2.49~
8.32 (7X)
/ .31 MIN FULL THREAD
,
I.
c"c
;
00
en 3' 3'
0
0
05
0
-!.
0
00'
~
/'
"~
.
-~
I
\
0"0".
0
ct>
ct> m
--
-----.,
~"-_ .. /
I
"
•
)
<0
-"
______ J ••
I
o
~
~
1+
1+
a
o
w
-"
-"
Or
CO
en
6"
_ _ _ _ _ _ _ JI
Q)
CO
ct>
0
...,
<'
ct>
0
3'
ct>
en
::J
o'
::J
en
~l1J
I
I
n(
-=i
-=i 1+
Q) til
-"
I
FUNCTIONAL
FACEPLATE
»
»CDg:
OJ
I\)
~
I
I-il-
u
...".
± .02
I
4.0 ± .02 ~ 4.0 ± 0.2 + - 4 . 0 ± .02 ~
(2X)
I /
(2X)
.798 ± ,020~
(2X)
--I
~
I
I
~~
Cd!
rn
-,
14.0 ± 1.00
- --
,25~
MOUNTiNG SLIDE
OJ
~
4.63 ± .06
!l:=Dim C (Table';::ij
TABLE 1
FRONT COVER
Decorative Cover Dimensions
Cover Size
Dim A
Dim B
DimC
4-5/8
x 10-1/2
10.50
.240
4.62
5-1/4
x 10
10.00
.240
5.25
t;_1/A
v
11 nn
7An
t; ?t;
11
I;~I~~a'~ce'
I~'.'~; I~ .·~30 I:'~~d
OJ
~ .487
,ri
I
If file is mounted on slides, file will extend 14 inches from operating position for servicing.
[g] With decorative cover this dimension is .38.
[ill
Handle extends .375 beyond faceplate.
@]
All dimensions are in inches.
I
6.3 Chassis Slide
Available as an optional accessory is a chassis slide kit PIN 50239. This kit contains two slides, one locking
and one non-locking, and seven screws. Dimensions of the slide are shown in Figure 19. For use on the standard casting only.
'----f::;
.
f-c-i:-=-"=:-";::'':::-=-=::'-...r.II - - - - - ,1
C~L...:.=..:=..:=-==-==-=:.=.-=-~l:ifi!:·
-=-=-Qi_ii-::!!'::==--=-!::=-==~~-!!i-:il-r=1=
..--iiiio-iiiiioiiiiiooiiiiiiii-_·iiiooiiiii-. .-iioiiiiiioz1------_...Jd
-...
l
~1J~~g~
j.....
.----V=TRAVEL ± .06---...:--1......
- - - X =LENGTH ±
I
·1
~,
---I fi--....
~
r---
.75
---I
_.
----.:.~
1="':: ~
... . I
... - - ( - '
I=.-=-~
=-:-----:..:-l&
- - - - J.. - - .....
___
~A--.j
B
--
....
@
.75-.1
...:...
"'-E
----
±.03
+-
t-
..... D
-
C
I
-
I
I .... J4
.. _ . _
I
=1:--=--=- ==
=-
"
.03----~
~
-...
F
G
-
H
I---
--
LENGTH/TRAVEL VIEW
0.7....L-:_·..,,·
±.02
2.00
STANDARD MOUNTING
HOLE SIZE .177 DIAM.
x
V
A
B
C
D
E
F
G
H
. 14
15
4.00
8.00
12.00
1.00
3.50
8.50
11.50
12.50
Figure 19. Slide Mounting Dimensions
6.4 Decorative Face Plate
The SA800/801may be ordered with one of the following decorative face plates:
COLOR
SIZE
4 5/8 x 10 1/2
4 5/8 x 10 1/2
5 1/4 x 10
5 1/4 x 10
5 1/4 x 11
5 1/4 x 11
"R" Series-4 5/8
x 8 11/16
Tan
White
Tan
White
Tan
White
Tan
PART NO.
50264
50263
50261
50260
50258
50257
50675
If another color is required to match the system's color scheme, the face plate may be painted. The following information should be utilized to avoid potential problems in the painting process.
1. The front cover is made from GE's LEXAN. Dimensional stability of LEXAN exists from -60°F + 250°F. If
the type paint used requires baking, the temperature should not exceed + 250°F, includingany hot spots
which can contact the cover.
2. LEXAN is a polycarbonate. Any paint to be used should be investigated to insure that it does not contain
chemicals that are solvents to ,polycarbonates.
25
~i.~~ .04
--1
1 T~8.32
~ ~ i I 1.../1
!!
cg
l\)
(j)
:
.38 ±.013
.01,
I
_
14.00 ±
Ci5
a-""
JJ
3'
CD
~
00
0"
~
.00
(X)
en
~
-.....l
~
CJ1
CJ1
-.....l
1+ 1+
1+
0l\) 0l\)
0
(j)
(X)
~
m
f
~
·06----------J1
X .2 5 DP(4X}
a
a
o
.
x .25 DP(4X)
.mJ
.~5: m:~:F~8.32
(2X)
•.1
•
1
D
o
~
C11
C11
1+
.1
ow
OJ
Dimension is from end of base casting.
I
[2] Cosmetic front cover height.
lID
Functional front plate height.
@] Cosmetic front cover width.
(5) Functional front plate width.
CJ1
,l::o.
1+
o
l\)
I ... I ..
oa
1+
o
-""
3.50 ± .01
mJ
Cosmetic fron cover thickness.
m Functional front plate thickness.
[ill Cosmetic front cover color comes only in tan.
7.0 CUSTOMER INSTALLABLE OPTIONS
The SA800/801 can be modified by the user to function differently than the standard method as outlined in
sections 3 and 4. These modifications can be implemented by adding or deleting traces and by use of the
Alternate I/O pins. Some traces are capable of being connected by use of a shorting plug, Shugart PIN 15648
or AMP PIN 530153-2. This section will discuss a few examples of modifications and how to install them. The
examples are:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Drive Select one to eight drives.
Select drive without loading head or enabling stepper.
Select drive and enable stepper without loading the head.
Load head without selecting drive or enabling stepper.
Radial Ready.
Radial Index/Sector.
Eight, 16, or 32 Sector option.
In Use (Activity L.E.D.) optional input.
Write Protect options.
Tabulated below are the trace options with the condition of the trace as it is shipped from the factory. Figure
21 shows the location of these traces on the PCB.
CUSTOMER CUT/ADD TRACE OPTIONS
TRACE
DESIGNATOR
T3,T4,T5,T6
T1
T2
-0-51,OS2,OS3,OS4
RR
~I
R,I,S
HL
DB
WP
-NP
8,16,32
0
2,4,6,8,10,12,14,16,18
U1,02,D4,OD8
A,B,X
C
Z
Y
DC
NFO
TS
SHIPPED FROM FACTORY
SHORT
OPEN
Terminations for Multiplexed Inputs
Pluaaed
Terminator for Drive Select
Pluaaed
Spare Terminator for Radial Head Load
X
Drive Select Input Pins
OS1 is
X
Pluaaed
Radial Ready
X
Radial Index and Sector
X
Ready, Index, Sector Alternate Output Pads
X
Stepper Power From Head Load
Pluaaed
Stepper Power From Drive Select
X
Inhibit Write When Write Protected
X
Allow Write When Write Protected
X
8, 16, 32 Sectors (SA801 Only)
8 & 16
32
Alternate Input-In Use
X
Nine Alternate I/O Pins
X
Customer Installable Decode Drive Select Option
X
Radial Head Load
Pluaaed
Alternate Input-Head Load
X
In Use from Drive Select
Pluaaed
X
In Use from HD LD
Alternate Output-Disk Change
X
X
Non Force Out
True FM Data Separation
X
DESCRIPTION
27
FLAT RIBBON OR
TWISTED PAIR
MAX 10 FEET
DISK CHANGE·
IN USE·
HEAD LOAD·
SA800/801
J1
12
-
16
-
18
INDEX--
-
-
-
READ DATA
A['G7!O
NOTE:
43
45
47
49
50
J5
.
5
.:
-5 VOC (-I' to -16 VDC)**
-
4
+ 24 VDC
+ 24 V RETURN
TWI S TED PAIR
41
44
+5 VDC
x
39
40
-
ACINPUT
FRAME GROUND
ACINPUT
37
48
SEP CLOCK
-
35
36
46
. SEP DATA
I
33
42
WRITE PROTECT (OPTIONAL)_
--
31
38
TRACK 00
-
29
34
WRITE DATA
DC GND
27
32
DIRECTION SELECT
I
25
30
DRIVE SELECT 4
-:b-
23
28
DRIVE SELECT 3
I
21
26
DRIVE SELECT 2
-
19
24
DRIVE SELECT 1
WRITE GATE
17
22
SECTOR (80"1 ONLY)
STEP
15
20
READY
6
3
2
1
-
11
-=~
J4
1
~~
FRAME GNO
Not shown are 5 of the 9 Alternate 110 connections The connections for these lines are on
pins 2, 4, 6. 8, 10 and 14. Signal reLJrn for these lines are on pins 1. 3. 5. 7. 9 and "13 respectively.
*These lines are alternate input/output lines and fhey are enabled by jumper plugs
.... Not required on LSI PCB's
FIGURE 40. INTERFACE CONNECTIONS
1.9.4 Output Lines
There are seven (7) output lines from the SA800 and eight (8) from the SA80l. There also is one (1) optional
output line from the SA800/80l.
The output signals are driven with an open collector output stage capable of sinking a maximum of 40 rna at
a logical zero level or true state with a maximum voltage of 0.4V measured at the driver. When the line driver
is in a logical one or false state the driver is off and the collector current is a maximum of 250 microamperes.
The receiver should be' a Schmidt trigger t~pe device.· Refer to Figure 41.
FIGURE 41.
29
7.1 Drive Select . One to Eight Drives
TRACE
Customer installed option allows up to eight
drives to be multiplexed together. This method of
drive selection uses a binary address to select a
drive.
ADDRESS
01
D2
D4
a
0
1
'I
a
a
a
a
a
a
To install this feature on a standard drive, the
following traces should be added or deleted:
1. 'Add a 74L85, 4 bit comparator (Motorola
PIN MC 14585, National Semiconductor
PIN MM 74c85) into position 28 on PC8,
(1A on PC8 25136).
2. Connect trace' DDS'.
3. Insure traces 'DS1' - 'DS4' are plugged.
4. Jumper traces 'D1', 'D2', and 'D4' according to table below for address of each
drive.
2
a
1
3
"I
1
4
()
5
"I
a
a
1
6
0
1
1
7
1
1
1
INTERFACE PIN
DRIVE
26
28
30
32
a
a
a
a
a
a
a
a
a
1
1
1
a
1
1
1
1
a
a
a
1
1
a
a
a
1
The four Drive Select lines are to be used for addressing the drives.. Pin 26 is used as Drive
Select enable and phis 28 (binary 1), 30 (binary
2), and 32 (binary 4), are the address lines.
Figure 23 illustrates the circuitry. The table
below shows the logical state each line must be
at to select each of the drives.
4
Figure 23 illustrates the circuitry.
5
1
2
3
6
7
+5VDC
1
D2
15 A3 Vce 16
2 A2 Gnd4
Gnd 5
7 A1 Gnd8
10 AO
D1
-DRIVE SELECT 3
-DRIVE SELECT 2
-DRIVE SELECT 1
a
a
a
a
a
. . . . STANDARD TRACE
D4
-DRIVE SELECT 4
1
1
. . . . ADDED TRACE
a
DRIVE ADDRESS
2 SHOWN
1
-
32
14 83
30
1 82
28
9 81
26
11 80
A=8
....··c·
.q-
(j)
o
C")
C\l
......
(j)
(j)
(j)
0
0
0
3
DDS
-DRIVE SELECT
Figure 23. Drive Select Circuitry
30
111.41
DELETED TRACE
7.2 Select Drive Without Loading Head Or Enabling Stepper Motor
This option would be advantageous to the user who requires a drive to be selected at all times. Normally,
when a drive is selected, its head is loaded and the stepper motor is energized. The advantage of this option
would be that the output control signals could be monitored (with the exception of Track Zero, which requires the stepper to be energized) while the head was unloaded thereby extending the head and media life.
When the system requires the drive to perform a Read, Write, or Seek,the. controller would activate the
Head Load line (pin 18) which in turn would load the head and energize the stepper motor. After the Head
Load line is activated, a 3Sms delay must be introduced before Write Gate and Write Data may be applied or
before Read Data is ·valid.
To install this option on a standard drive, the following traces should be added or deleted:
1. Jumper trace 'T2'.
2. Remove jumper from trace 'X'.
3. Jumper trace 'C'.
Figure 24 illustrates the circuitry.
2
3_
-DRIVE SELECT 4 -v-_
......"""
-DRIVE SELECT 3 -v-...;.3_0
+--....'"
-DRIVE SELECT 2 .~)(.-.2-8---_--.....__+___......
-DRIVE SELECT 1 -v_2_6
+--+---+~
+SVDC
{
2
)(
ALTERNATE
I/O PI NS
~
4
16
2
.~~
4~~\
~':::.~~\
16 ~\
.=:::~J' + SVDC
)( 18
+ DRIVE
-.___e__-Jl-----~SELECT
L...-. . ._ _
18l/
II
II
\\
,'..
\'
'''::'==,:::,::-~
X
C
-DOOR CLOSED
~
~----------___ex---"
_
STANDARD TRACE
IIfIil
DELETE D TRACE
.+ HEAD
LOAD
...... ADDED OR JUMPERED TRACE
*NOTE:
If the -Head Load line is multiplexed, terminator 'T1'
jumper must be removed from each drive except
the last one on the line. Also, the current requirement for the + 24 VDC supply should be a mUltiple
of the maximum + 24 volt current times the number
of drives on the line that have Head Load active.
Figure 24. Select Drive Without Loading Head Circuit
31
7.3 Select Drive and Enable Stepper WithouU Loading Head
This option is useful to the user who wishes to select a drive and perform a seek operation without the head
being loaded or with door open. An example use of this option is that at power on time, an automatic
recalibrate (reverse seek to track zero) operation could be performed with the drive access door open. Normally for a seek to be performed, the door must be closed and the head loaded. Other advantages are those
listed in section 7.2 in addition to being able to monitor Track Zero. When a Read or Write operation is to be
performed, the head must be loaded (pin 18). After the Head Load line is activated, a 35 ms delay must be introduced before Write Gate and Write Data may be applied or before Read Data is valid.
To install this option on a standard drive, the following traces should be added or deleted:
1.
2.
3.
4.
5.
Jumper trace 'T2'.
Remove jumper from trace' B'.
Remove jumper from trace' HL'.
Jumper trace' OS'.
Jumper trace 'C'.
Figures 24 and 25 illustrate the circuitry.
7.4 Load Head Without Selecting Drive Or Enabling Stepper
This option is useful in disk to disk copy operations. It allows the user to keep the heads loaded on all drives
thereby eliminating the 35 ms head load time. The head is kept loaded on each drive via an Alternate I/O pin.
Each drive may have its own Head Load line (Radial or Simplexed) or they may share the same 1ine
(Multiplexed). When the drive is selected, an 8 illS delay must be introduced before a Read or Write operation can be performed. This is to allow the R/W head to settle after the stepper motor is energized. With 1this
option installed, a drive can only be selected with both Drive Select and Head Load active.
To install this option on standard drive, the following traces should be added or deleted:
1.
2.
3.
4.
*5.
Jumper trace 'T2'.
Remove jumper from trace 'A'.
Remove jumper from. trace 'H L' .
Jumper trace' DS'.
Jumper trace 'C'.
* If the -Head Load line is multplexed, terminator 'T1' jumper must be removed from each drive except the
last one on the line.
Figures 25 and 26 illustrate the circuitry.
NOTE: The 8 ms delay may be eliminated by
keeping trace 'DS' open. This would
keep the stepper motor energized at all
+ HEA.D LOAD
S~-------------,--s
times. If this is used, the current require+5V ~
HL
ment of the + 24 VDC supply must be a
multiple of the maximum + 24 Volt current times the number of drives on the
+ DRIVE SELECT
line.
DS
.c.
!
FROM STEP
COUNTER
Figure 25. Stepper Motor Enable Circuit
32
TO STEPPER
-DRIVE SELECT 4
32
-DRIVE SELECT 3 ~)(~30
-DRIVE SELECT 2
-+
--",-
)( 28
-DR~VE SELECT 1 )( 26
+SVDC
2
)(4
ALTERNATE
I/O PINS
{
-HEAD LOAD
2
.~~
~~~~-~~IL~t~~
)(
16
18
16 \\
.=:::::4J + SVDC
18::
l - -.....
+ DRIVE
SELECT
1---__.
+ HEAD
LOAD
0-'- ..., ... , ... -----.
II
\\
..
\~
. . . .::r==.::::::-~
C
-DOOR CLOSED
S
. .~ ---'---------a..~
...... STANDARD TRACE
iiii'll
DELETED TRACE
. - . ADDED OR JUMPERED TRACE
*IF THE -HEAD LOAD LINE IS MULTIPLEXED; TERMINATOR 'T1' JUMPER MUST
BE REMOVED FROM EACH DRIVE EXCEPT THE LAST ONE ON THE LINE.
Figure 26. Load Head Without Selecting Drive or Enabling Stepper Circuit
7.5 Radial Ready
This option enables the user to monitor the Ready line of each drive on the interface. This can be useful in
detecting when an operator has removed or installed a Diskette in any drive. Normally, the Ready line from a
drive is only available to the interface when it is selected.
To install this option on a standard drive, the following traces should be added or deleted:
1. Cut trace 'RR'.
*2. Cut trace' R'.
*3. Add a wire from pad' R' to one of the Alternate I/O pins.
"'One of the drives on the interface may use pin 22 as its Ready line, therefore, steps 2 and 3 may be
eliminated on this drive. All the other drives on the interface must have their own Ready line, therefore steps
2 and 3 must be incorporated.
Figure 27 illustrates the circuitry.
33
+ DRIVE SELECT
+ READY
S
~O__'I__-.-2-2~)(--, -READY
D-
S----------·-L-.-J
,,'f
,{ \\
\\
l\\
\\~~
DELETED (CUT)TRACE
l1-li
ADDED TRACE
2
300t
\~~• •--4-,--4-l)(
__
~
~
\~,"~ ... '16
. . . . STANDARD TRACE
1IIJ11
2
\\ ~----_3~--
II
~~. 18
16
~
X
18)(
Figure 27. Fladial Ready Circuit
7.6 Radial Index/Sector
This option enables the user to monitor the Index and Sector lines at all times so that the drive may be
selected just prior to the sector that is to be processed. This option can be used to reduce average latency.
To install this option on a standard drive the following traces should be added or deleted:
1.
*2.
*3.
*4.
*5.
Cut trace 'RI'.
Cut trace' I'.
Cut trace'S'.
Add a wire from trace 'I' to one of the Alternate I/O pins.
Add a wire from trace'S' to one of the Alternate I/O pins.
*One of the drives on the. interface may use pin 20 (-Index) and pin 24 (-Sector) as its Index and Sector lines,
therefore, steps 2-5 may be eliminated for this dr~ve. All other drives on the interface must have their own Index and Sector lines, therefore, steps 2-5 must be incorporated.
Figure 28 illustrates the circuitry.
+ DRIVE
_
SELECT
S~---l'
STANDARD TRACE
II{~ DELETED (CUn TRACE
. - . ADDED TRACE
.
+ INDEX
s
+ SECTOR
s
RI
ALTERNATE
I/O
-INDEX
-SECTOR
Figure 28. Radial Index/Sector Circuit
34
7.1 Eight, 16, Or 32 Sectors
The SA801 , as shipped from the factory, is set up to provide 32 Sector pulses per revolution of the Diskette
onto the interface. This option is provided for the user who wishes to have eight or 16 Sectors per revolution.
The logic divides the Sector pulses by two or four. Reference Figure 29 for the timing relationships.
To install this option on a standard drive (SA801), the following traces should be added or deleted:
1. Cut trace '32'.
2. Connect trace '16' for 16 Sectors or connect trace '8' for eight Sectors.
Figure 30 illustrates the circuitry.
INDEX
32 SECTORS
I_
16 SECTORS
..1
10 .4 ± .4 MS
l'
l..-S----,~_l
~
8 SECTORS
,
20.8 ± .6
___.. . . -----l
Ms----II~-.l1
1
_
* INDICATES BEGINNING OF SECTOR 1 IN RELATIONSHIP TO INDEX
Figure 29. Sector Timing Relationships
+ SECTOR
+ DRIVE
SELECT
32
-SECTOR
8
...... STANDARD TRACE
II{AI
DELETED (CUT) TRACE
...-. ADDED TRACE
-INDEX
Figure 30. Sector Divide Circuit
35
7.8 In Use Alternate Input (Activity LED)
This alternate input, when activated to a logical zero level, will turn on the Activity LED mounted in th(~ pusl',
bar on the front panel of the drive. It can be used as an indicator to the operator. Examples of some indica.tions are:
1. 'Nrite protected Diskette is installed.
2. Drive in which the diskette is to be changied.
3. The operating system drive.
4. Drive with a special configuration.
To install this option on standard drive, jumper trace' 0' and active the interface line pin 16.
This signal is an "OR" function with Drive Select or Head Load. Figure 31 illustrates the circuitry.
2
----V~--I• •=::~~
4
ALTERNATE
110 PINS
- - -.....--.~::~ .......
~
16
~\
\~\
~~~\
+5V
"\\
\\
\\
••
•
1500
750
D~
.........-----tl__-'
-DRV SEL INT ~------t
-HEAD LOAD
s".~
-------
__-
. -.....__2_,!7_ _
-y-
+ IN USE
(TO LED}
J6
_ _~'V\ll_G+ 5V
Figure 31. In Use/Activity LED Circuit
7.9 Write Protect Optional Use
As shipped from the factory, the optional Write Protect feature will internally inhibit writing when a Write Protected Diskette is installed. With this option installed, a Write Protected Diskette will not inhibit writinQi, but i:t
will be reported to the interface. This option may be useful in identifying special use Diskettes.
To install this option on a drive with the Write Protect feature, the following traces should be added or
deleted:
1. Cut trace 'WP'.
-'-2. Connect trace' NP'.
Figure 32 illustrates the circuitry.
-\lIlRITE PROTECT
S'r-------~~-----,
-WRITE GATE
5
..
~
TOINTEFlFACE
D----.. .
TO WRITE CUFIRENT
Figure 32. Write Protect Circuit
36
7.10 Disk Change (Alternate Output)
This customer installable option is enabled by jumpering trace' DC'. It will provide a true signal (logical zero)
onto the intertace(pin 12) when Drive Select is activated if while deselected the drive has gone from a Ready
to a Not Ready (Door Open) condition. This line is reset on the true to false transition of Drive Select if the
drive has gone Ready. Timing of this line is illustrated in Figure 33. The circuitry is illustrated in Figure 34.
-DRV SEL
-READY
-DISK CHG
Figure 33. Disk Change Timing
D---
-READY
-DRV SEL 'r-------4I...----oQ
Figure 34. Disk Change Circuit
37
......._-.-.-~~-
-DISK CHG
8.0 OPERATION PROCEDURES
The SA800/801 was designed for ease of operator use to facilitate a wide range of operator oriented applica..
tions. The following section is a gUide for the handling and error recovery procedures on the diskette and
diskette drive.
8.1 Diskette Loading and Handling
The diskette is a flexible disk enclosed in a plastic jacket. The interior of the jacket is lined with a wipin9
material to clean to disk of foreign material. Figure 35 shows the proper method of loading a diskette in the
SA800/801 Diskette Storage Drive. To load the diskette, depress latch, insert the diskette with the label fac"
ing out. (See Figure 35). Move the latch hand~e to the left to lock diskette on drive spindle. The diskette can
be loaded or unloaded with all power on and drive spindle rotating.
h
(i
{
)
I
f/-
~
Figure :35. Loading SA800/801
/
38
When removed from the drive, the diskette is stored in an envelope. To protect the diskette, the same care
and handling procedures specified for computer magnetic tape apply. These precautionary procedures are
as follows:
1. Return the diskette to its storage envelope.
2. Keep cartridges away from magnetic fields and from ferromagnetic materials which might become
magnetized. Strong magnetic fields can distort recorded data on the disk.
3. Replace storage envelopes when they become worn, cracked or distorted. Envelopes are designed to protect the disk.
4. Do not write on the plastic jacket with a lead pencil or ball-point pen. Use a felt tip pen.
5. Heat and contamination from a carelessly dropped ash can damage the disk.
6.00 not expose diskette to heat or sunlight.
7. Do not touch or attempt to clean the disk surface. Abrasions may cause loss of stored data.
8.2 Write Protecting a Diskette
Shugart Media has the capability of being write protected. The write protect feature is selected by the notch
in the media. When the notch is open it is protected; when covered, writing is allowed. The notch is closed by
placing a tab over the front of the notch, and the tab folded over covering the rear of the notch. The Diskette
can then be write protected by removing the tab. Refer to Figures 36 and 37.
FOLD OVER BACK
OF DISKETTE
TAB
r-
Figure 36. Diskette Write Protected
.200
Iil
+
.010-1
I --'--
.150 ± .005
.075R ± .005 .....
---
D
o@
c=:>
T
6.175 ± .005
1
Figure 37. Write Inhibit Notch Specifications
39
9.0 ERROR DETECTION AN D CORRECTION
9.1 Write Error
If an error occurs during a write operation, it will be detected on the next revolution by doing a read operation, commonly called a "write check." To correct the error, another write and write check operation must
be done. If the write operation is not successful after ten attempts have been made, a read operation should
be attempted on another track to determine if the media or the drive is failing, If theenor still persists, the
disk should be considered defective and discarded.
9.2 Read Error
Most errors that occur will be "soft" errors; that is, by performing an error recovery procedure the data will
be recovered.
Soft errors are usually caused by:
1. Airborne. contaminants that pass between the read/write head and the disk. These comtaminants will
generally be removed by the cartridge self-cleaning wiper.
2. Random electrical noise which usually lasts for a few p.sec.
3. Small defects in the written data and/or track not detected during the write operation which may cause a
soft error during a read.
The following procedures are recommended to recover from the above mentioned soft errors;
1. Reread the track ten times or until such time as the data is recovered.
2. If data is not recovered after using step 1, access the head to the adjacent track in the same direction
previously moved, then return to the desired track.
3. Repeat step 1.
4. If data is not recovered, the error is not recoverable.
40
J1 Shugart
Copyright ShLlgcut
475 Oakmead Par~way
Telephone: (408) 733·0rOO
5/80 50574-4
Sunnyvale, California 94086
TWX: 910 339 9355 SHUGART SUVL
PRINTED IN U.S.A
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