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Publication Number 29-324

M46-102

CRT
(EDITING)
INSTRUCTION M'ANUAL
CONSISTS OF:
02-312A20
02-312A22
02-312808

I nstallation Specification
Programming Specification
Schematic

•

X::a;r·....:EI::a;c, I

• .a..IiJlI"~

2 Crescent Place, Ocea.nport, New Jersey 07757

.©

INTERDATA INC., 19"13

All Rights Reserved
Pri'lted In U.S.A.
ScC'";'·,,;)er 1973

02-312A20
August 1973

M46-102

CRT
(EDITING)
INSTALLATION SPECIFICATION

1.

GENERAL

The editing CRT has two Marketing Numbers; M46-102 for the 115/V60Hz version and M46-103 for 240/50Hz. The
conversion from 115/60 to 240/50 is implemented with switch options in the CRT. Each product consists of a desktop CRT with keyboard. No other hardware is included. The cables and interfaces which are required may be purchased separately. Table 1 relates Marketing and Hardware Numbers. The interconnections are shown in Figures 1
and 2.
TABLE 1. CRT MARKETING/HARDWARE NUMBERS

MARKETING
NUMBER

HARDWARE
NUMBER

M46-102

27-054FOO

CRT-Editing, 115V, 60 Hz

M46-103

27-054F01

CRT-Editing, 240V, 50 Hz

M46-106

17-272

CABLE, CRT-PASLA, 25 Ft.

M46-105

1"1-274

CABLE, CRT-MODEM, 50 Ft.

M46-102

02-279

PASLA 7" INF, RS-232

29-325

CRT Vendor Manual

DESCRIPTION

17-197
PIO PASLA

M46-106
(17-272)

M46-1 02/1 03

o

PASLA
M46-102

Figure 1. PAS LA-CRT (Local) Connection

1

17·197

17·105
(17·274)

PIO PASLA

PASLA

M46·102

Figure 2. PASLA·CRT Remote Connection

2. INSTALLATION
The CRT Terminal has been carefully packed to insure its arrival in operating condition; however, use the following
procedures to establish the mechanical integrity of the unit and prepare it for operation.
2.1 Unpacking
Inspect the shipping carton for external damage. As the equipment is unpacked, check for signs of damage or missing
parts.
2.2 Equipment Placement
The CRT Terminals are self-contained and include an attractive enclosure and non-scuffing rubber feet for protection
of desk and table tops. Connectors are provided for power (2-'wire plus' groun.d), detachable keyboard, video output for
remote TV monitor, and communicatiQIl line (modem or direct connection to Processor). Clearance is required for convection cooling of the electronics.
2.3' Options (Refer to Figures 3 through 7)
Optional features are normally enabled at the factory. If the features are specified at time of order , they are pre-set
at the factory. If, however, the CRT is not purchased with an interface or if the customer does not specify options, it
is necessary to inspect the PC boards in the CRT and adjust the option switches for the individual requirement. In
order to do this, proceed as follows:
'
1. Release the three! turn fasteners on the back panel and remove the back cover.

Pull back the two
slide latches (at the bottom rear corners), and push forward and upward (enclosures rotated from
the bottom front).

2. Remove the following PC Boards.

LOCATION
Timing Generator
Line Memory and Character Generator
Control
Serial I/O
Serial I/O

1
2

4
6
8

3. Refer to Figures 4 through 7 and implement the required options. The normal options are:
LINE MEMORY AND CHARACTER· GENERA TOR LOCATION 2
1. Character Color
"2. Carriage Return Symbol
3. Cursor Symbol

2

White on Black
Not Displayed
Not Displayed

CONTROL - LOCATION 4
1. Auto Line Feed
2. Roll Up

No
Yes

SERIAL I/O - LOCATION 6
1. Parity
2. Number of Bits
3. Bell
4. Transmit Code

Even Transmitted
. 10
EOL Bell Enabled
X i 6A'

SERIAL I/O - LOCATION 8
1. Baud Rate

9600 For Local CR T
300 For Remote CRT
None
No
Normal
Full

2. Parity

3. Receive Inhibit
4. Clock
5. Duplex

4. Place the Timing Generator PC component side up, card edge connector to the right. The two position
switch in the lower left corner should be oriented
for 60 Hz and CD for 50 Hz.

e

5. Replace all PC boards.
6. Verify that the AC Select switch located at the rear of this CRT (See Figure 3) is in the proper position
to select 115/240 VAC for the low voltage power supply and CRT high voltage power supply. DOWN is
for 115 VAC and UP is for 240 VAC.
7. Install all PC boards and the rear cover.

3. APPLYING POWER

Before connecting power to the Terminal:
1.

Turn the POWER switch on the. back panel to OFF.

2. Pl~g the keyboard cable into KB-J3 on the back panel. Insure that the slide locks on the connector are
securely fastened.
3. Attach the appropriate interface cable to J1 and fasten securely with the two 4-40 screws.
4. Attach the power cord to the POWER CONNECTOR on the back panel and to a standard 115 VAC, 60 Hz, 3
wire grounded outlet (or to 240 VAC if so ordered).
WARNING
USE A 3 PRONG ADAPTER WITH A SAFETY GROUND
PROPERLY CONNECTED. NEVER CUT THE SAFETY
GROUND PIN ON THE POWER CORD FOR USE WITH A
2-HOLE SOCKET AS SUCH ACTION PRESENTS A SHOCK
HAZARD.
5. Turn the POWER switch ON. When the power is applied to the unit, the POWER switch is illuminated.
If the switch fails to light, check the 2 amp fuse on the ba.ck panel.
6. Allow apprOXimately one minute for the CRT filament to warm up. The blinking cursor should appear in
the upper left corner of the' screen. If the cursor still does not appear, a malfunctiop is indicated.
7. The 06-146 CRT Test Progr.am may now be executed for Local Operation.

4. PASLA INTERCONNECTIONS
The CR T may be interfaced to an INTERDA TA Processor through the PAS LA. The PASLA contains the hardware to
receive and transmit most of the normal RS-232C- lines in an asynchronous mode. These lines include: RING, DSRDY,
CARRIER, DTR, RQ2S, CL2S, TDATA, RDATA', REV CHAN REC, and REV CHAN TRANS.
When connecting the PASLA to a CRT (or most other iocal terminals), it is necessary to disable (force to zero) the
RS-232 status bits which are not equipped on the terminal. The PASLA has wire-wrap stakes equipped for this purpose. The following is a summary of PASLA straps required for operation with the M46-102 or M46-103 CRT.

STRAP

FUNCTION

7-8 (Add)

FDX option

CF-GO (Add)

Force CARR· Status

CB-G3 (Add)

Force CL2S active

HD-G4 (REMOVE)

FDX Option

=0

. In: addition, the straps A1-K1 must be equipped to select the required baud rate. This may be in the range of 75 to
9600 baud and is described in the PASLA Instruction Manual, Publication Number 29-310, which is included with the
PASLA. Note that the character format/baud rate of PASLA is programmable. The CRT must be strapped to match
these programmed character·istics.

VIDEO
OUT

o':~D
FDPX
HDPX

r~1

o

Bm
115

KBD"

ON POWER OFF

BAUD .
.
(Optional)
O RATE

J3

2A

120V
60Hz

o

FUSE

®
o

0

POWER CONNECTOR

Figure 3. CRT Rear View

4

NOTE:

§
.:::

TWO METHODS OF PCB OPTION SELECTION ARE USED
1)

Two position selector switch

2)

Jumper selector.

OPTION:

CARRIAGE RETURN SYMBOL

DISPLAYED:

Selector switch, CCW
Jumper, solid line

NON DISPLAYED:

Selector switch, CW
Jumper, dotted line

OPTION:

CHARACTER COLOR

OPTION:

CURSOR SYMBOL

Black on White:

Selector switch, CW
Jumper dotted line

DISPLA'YED:

Selector switch, CW
Jumper, solid line

White on Black

(Normal Video):
Selector switch, CCW
Jumper, solid line

NONDISPLAYED:

Selector switch, CCW
Jumper, dotted line

Figure 4. Switch/Jumper Options on 27-054' Line Memory and Character Generator PCB-Location 2.

sO 0 002

1$1

01

CONTROL

9330'24

AUTO LINE FEED:
~~~~--~-----JUMPER IN - YES
JUMPER OUT - NO

ROLL UP:
IN -

~------------------------------------~JUMPER

YES

JUMPER OUT -

NOTE:

TWO CONTROL PCB LAYOUTS ARE IN USE AND AFFECT
THE LOCATION OF JUMPER WIRE LOCATIONS AS SHOWN.

Figure 5. Jumper Wire Options on 27-054 Control PCB-Location 4.

6

NO

NOTE: TWO METHODS OF PCB OPTION SELECTION ARE USED

8

1)

Two position selector switch

~2)

Jumper selector.

~
SERIAL 1/0-6A
930153_

~I
z

if)

S2

OPTION:
TRANSMITS
CODE 6A

Selector Switch CW
Jumper, dotted line

TRANSMITS
CODE 6B

Selector Switch CCW
Jumper, solid line

J3

o~

[1] [I] [iJ [i] I: [i] rn rn:1 [I] [i] [in [i]
[1]1'[1] [i] [iJ [i] [i] rn w[I]J:[I] [IJ
[i] [i] rniLiJ [i]~[i] ww[i] [i]
[1]g 'I [i] 'w [I] [fJ~rn [l] w
w~ ~lltl~ [iJ rn w
[1]1[1]
~ ~ ~
,...

~

-

0

-c

g

;!:

:;

~

~

-c

~

~

~

~

~

~

;!:

~

a:

:3

~

.

~

~

~ u«

;!:

;!:

~ '"

lLI,

a:

~

"

Q
~

~

,

;!:

;!:

~

"

~

"

;!:

c-_ _ _

]

[REL]

0

0

0

0

0

NUL

DLE

0

0

0

1

1

SOH

DCl

!

1

A

Q

0

0

1

0

2

[STX]

DC2

"

2

B

R

(BFKl)

BFK2

0

0

1

1

3

HETX>]

DC3

#=

3

C

S

[EEOLJ

[EEOP]

0

1

0

0

4

(EaT)

DC4

$

4

D

T

[IC]

[DC]

0

1

0

1

5

(ENQ)

NAK

%

5

E

U

[IL]

[DLJ

0

1

1

0

6

ACK

SYN

&

6

F

V

[CS]

[DM]

0

1

1

1

7

[BEL]

ETB

,

7

G

W

[( - ) ]

[(-)]

1

0

0

0

8

BS

CAN

(

8

H

X

[(

1

0

0

1

9

[TAB]

EOM

)

9

I

Y

[(HOME)]

[SPS]

1

0

1

0

A

[(LF)]

[SUB]

(* )

:

J

Z

[(XMIT)]

[EPSJ

1

0

1

1

B

VT

(ESC)

+

;

K

[

1

1

0

0

C

FF

FS

,

<

L

"-

[LCA]

[EBS]

1

1

0

1

D

[(CR)]

GS

-

=

M

]

[RCA]

[LOCK]

1

1

1

0

E

SO

RS

>

N

1\

SDR

[HLO]

1

1

1

1

F

SI

US

?

0

-

/

• )]

t )]

[(

[SBS]

[CDP]

(RUB)
OUT

The symbols used on Table 2 that are recognized by the terminal are explained below. An asterisk (*) beside the
symbol means that the shift key must also be depressed.
STX

Start of Text.

ETX

End of Text. The ETX character ( J ) is displayed.
PRINT functions.

ENQ

Depressing the HERE IS key generates the ENQ code, ASCII 05.
back when option is provided.

BEL

Bell Code. Rings bell in the keyboard when received.

4

The STX character ( J. ) is displayed.
The ETX code effects the XMIT and

Initiates automatic answer

TAB

Field Tab Code. Causes the cursor to advance to the position immediately following the
next tab stop (EPS Code). If no tab stops are present,the cursor will stop at the Home
position.

LF

Line Feed. Causes 'cursor to descend one line, or causes roll-up from bottom line if option
is selected.

CR

Carriage Return. The cursor goes to the beginning (left) of the present line. An Automatic
Line Feed may be optionally generated.

SUB

The full 35 dot matrix ( • ) is displayed. This character is optionally displayed if a parity
error occurs on a received character.

PRINT

When the PRINT code is received by the terminal, a signal is sent to the optional hard copy
adapter to initiate off-line printing. The Processor must have previously issued a Keyboard
Lock. Characters are output from the present cursor position to the first ETX character, or
to the end of the page if no ETX is present. A Halt Local Output (HLO) command from the
Processor causes the printer to stop after the present character.

BFKl,
BFK2*

Blank Function Key. This key is located at the bottom left-hand position of the editing
controls keyboard. ASCII code 62 or 72 is generated when this key is pressed without or
with the Shift Key, respectively.

EEOL*

Erase to End of Line. All characters from the present cursor position to the end of the
same line are replaced with spaces (X'20'). Protected characters' will not be erased.

EEOP*

Erase to End of Page. All characters from the present cursor position to the end of the
page are replaced with spaces. Protected characters are not erased.

IC*

Insert Character. The character at the present cursor position and all characters to its
right (on the same line) are moved one space to the right. The cursor remains at the same
position whic~ is filled with a space (X'20'). The character moved off the end of the line is
lost. Thi&! function is iphibited if any protected characters are on the screen.

DC*

Delete Character. The character at the present cursor position is deleted. All remaining characters on the line move one space to the left. The right most character position
on the line is filled with a space (X'20'). This function is inhibited if any protected characters
are on the screen.

IL*

Insert Line. All characters in the present line and on the remainder of the page are moved
down one line. The present line is set to all spaces (X'20'), and the cursor moves to the
beginning (left) of the present line. The last line on the screen is lost. This function is inhibited if any protected characters are on the screen.

DL*

Delete Line. All characters in the pre~ent line are lost and all remaining lines on the
screen move up one line. The cursor goes to the beginning (left) of the present line. The
bottom line on the screen is filled with spaces (X'20'). This function is inhibited if any protected characters are on the screen.

CS*

Clear Screen. Spaces (X'20') are written into every position on the screen except those
positions that are protected. The cursor moves to the Home position or the first unprotected
location if the Home position is protected.

CM*

Clear Memory. Spaces (X'20') are written into every position on the screen, including
protected areas. The cursor moves to the Home positions.
Right Cursor. The cursor moves right one position. If already at the end of a line, the
cursor goes to the beginning of the line below. If at the end of the last line, the cursor
goes to the Home position. If the new cursor position is in a protected area, the cursor
goes to the first location following the protected area.

5

Left Cursor. The cursor moves left one position. If already at the beginning of a line,
the cursor goes to the end (right) of the line above. If at the home position, the cursor
goes to the end (right) of the last line on the page. If the new cursor position is in a protected area, the cursor goes to the first location ahead of the protected area.
Down Cursor. The cursor moves down one line, but remains in the same column. Ifat
the bottom line, the cursor moves to the top line, same column. If the new cursor position is in a protected area, it goes to the first location following the protected area.

t
HOME

Up Cursor. The cursor moves up one line, but remains in the same column. If at
the top line, the cursor moves to the bottom line, saine column. If the new cursor
position is in a protected a.rea, the cursor goes to the first location ahead of the protected area.
Home Cursor. The cursor moves to the beginning (left) of the first line on the screen.
If the Home position is protected, the cursor goes to the first unprotected location.

SPS

Start Protect Sequence. An SPS code can only be issued by the Processor. The Processor
must have previously issued a Keyboard lock. Any characters appearing after the SPS code
and before the next EPS code cannot be modified by Keyboard input. The cursor cannot be
manually positioned to a protected area. If the Processor first issues a Keyboard lock, it
can modify a protected area. If no EPS· code is present, the protected area is from the SPS
code to the end of the page unless the SPS code is at the Home position in which case protect is overridden. There must be at least one unprotected area.

EPS

End Protect Sequence. The EPS code is used to identify the end of a protected sequence
that began with an SPS code, or as a field tab. See TAB. The EPS code can only be issued
by the Processor. A Keyboard Lock must have been previously issued.

XMIT

Transmit. The XMIT function is used to transfer a page or partial page from the CR T to
the Processor. Normal operation of the XMIT function is as follows:
Operator

CR T Terminal

1.

Depress Local

Local Light goes on

2.

Compose message

Data displayed on screen

3. Place E TX at end of
message.

Processor

E TX character displayed
on screen

4. Home Cursor
5. Depress Remote

Remote Light goes on

6. Depress XMIT

X'6A' code output

Receives X'6A' code,
Prepares buffer,
Transmit Keyboard
Lock code,
Transmit XMIT code.
Switch P ASLA to
non-echoplex Read Mode.

7.

Message is transmitted to Processor
starting at the present
cursor position and continuing until an ETX is
encountered or the end of
the page.

Receives message,
Transmits Keyboard
release.

Optionally, the XMIT Key can be replaced by any pre-arranged code or set of codes. In response to this, the Processor
must transmit a Keyboard Lock and an XMIT code (X'6A') to start the transmission. Appendix 5 is a sample routine for
reading the CRT screen.

6

SBS

Start Blink Sequence. The SBS and EBS codes can only be issued by the Processor. Characters following an SBS code and preceeding the next EBS code blink at a 2 Hz rate.

EBS

End Blink Sequence. The EBS code is used to identify the end of a blink sequence.

LCA

Load Cursor Address. When the LCA code is received, the next two characters are
accepted as cursor addresses; first the horizontal address (column number), then the
vertical address (line number). The two addresses must be presented in ones complement form. The horizontal address can be within the range 0 to 79 decimal. The vertical address can be within the range 0 to 23 decimal. Any address outside the range is
ignored.
Table 3 shows the conversion from decimal to ones complement hexadecimal. From the
table, the proper sequence of output characters to position the cursor to column 7 of line
12 is:
X'6C'

LeA Code

X'78'

Column 7

X'73'

Line 12

TABLE 3. CURSOR ADDRESSES

X

0

1

2

4

5

6

7

8

9

0

7F

7E

7D

7C

7B

7A

79

78

77

76

1

75

74

73

72

71

70

6F

6E

6D

6C

2

6B

qA

69

68

67

66

65

64

63

62

3

61

60

5F

5E

5D

5C

5B

5A

59

58

4

57

56

55

54

53

52

51

50

4F

4E

5

4D

4C

4B

4A

49

48

47

46

45

44

6

43

42

·41

40

3F

3E

3D

3C

3B

3A

7

39

38

37

36

35

34

33

32

31

30

MSD

3

To change only the vertical or horizontal cursor address without affecting the other, substitute an invalid address
for the vector that isn't to change. For example, the following character sequence sets the cursor to column 72 of
the present line:
' .
X'6C'

LCA Code

X'37'

Column 72

X'OO'

Invalid address, no line change

Seven bits are used by the CRT to determine horizontal cursor address validity.
vertical address vaHdity.

Five bits are used to determine

7

Appendix 3 is a sample subroutine for cursor positioning.
Read Cursor Address. When the RCA code is received, the CRT transmits the two
character cursor address. The first character is the ones complement of the horizontal
address (column nuinber), the second character is the ones complement of the vertical
address (line number). The horizontal address is within the range X'7F' to X'30', disregarding the parity bit. See Table 3 •. The vertical address is within the range X'7F'
toX'68' disregarding the parity bit. The PASLA must not be in echoplex to receive the
cursor address.

RCA

Appendix 4 is a sample routine for reading in the cursor address.
LOCK

Keyboard Lock. The LOCK function is issued by the Processor to inhibit data input from
the keyboard.

REL

Release Keyboard. The REL function is issued by the Processor to re-enable data input
from the Keyboard.

HLO

Halt Local Output. Signals the Hard Copy Adapter to stop printing. See PRINT.

SDP

Set Data Panel. When received, the CET accepts the next character to light 1 of 16 indicators on the Data Panel Option.

CDP

Clear Data Panel. When received, the CRT clears all 16 indicators on the Data Panel
Option.

4. DATA FORMAT
The P ASLA may be programmed to accomodate a variety of character formats and baud rates. See the P AS LA Programming Specification, 02-270A22, in the 29-301 PASLA Instruction Manual, In addition, the CRT has switch options
to select parity, number of stop bits, and paud rates. This information is in Manual 29-327 which is included with the
CRT.
The following lists the standard characteristics:

PASLA
BAUD RATE

9600

DATA BITS

7
EVEN

PARITY

1

STOP BITS

Figure 3 shows the Character Format:

STOP
BIT

PARITY

~

I I
8

DATA

7

6

5

4

--------------------~.~I S:~:T
3

2

I

f

SERIAL DATA FLOW

Figure 3. Character Format

8

•

5. PROGRAMMING INSTRUCTIONS
The Processor I/O instructions are used to communicate with the CRT Terminal through the PASLA.
paragraphs describe how Processor I/O instructions may be used with the system.

The following

5. 1 Program Instructions
5. 1. 1 Sense Status (SS or SSR).

The Sense Status instruction is used to determine if character transfers

are complete.
5.1. 2 Output Command (OC or OCR). The Output Command instruction is used to set the PASLA to the.
Receiver or Transmitter Mode and to select character format. Two command bytes are required to perform these
functions with P ASLA.

5.1.3 Write Data (WD or WDR).

The Write Data instruction is used to output characters to the CRT ter-

minal screen.
5.1. 4 Read Data (RD or RDR).

The Read Data Instruction is used to input characters from the CRT ter-

minal.
5.1. 5 Acknowledge Interrupt (AI or AIR). The Acknowledge Interrupt instruction is used to service interrupts. Execution of this instruction returns the address and status of the interrupting line.
5.1. 6 Communications Instructions (PASLA only). The PASLA accommodates the Communication Instructions in the Communications Processors.
5.2 Status and Command Bytes

Table 4 contains the PASLA interface Status and Command Byte Data applicable to the CRT Terminal.
TABLE 4. STATUS AND COMMAND BYTE DATA
BIT
NUMBER

0

1

STATUS
(REC)

OV

STATUS
(TRANS)

..

2

3

4

5

6

7

PF

FR
ERR

0

BSY

EX

0

0

0

0

0

0

BSY

0

0

0

COMMAND
1

DIS

EN

DTR

ECHOPLEX

0

TRANS
LB

WRT/
RD

1

COMMAND

0

CLK

2

+---DATA BITS

.

STOP
BITS

..

PARITY

..

0

STATUS
*OV

The Overflow status bit is set if the previously received character is not read before the
present character is assembled. Overflow is reset at the end of the next Read Data only
if the failure condition disappears (i. e., a Read Data is issued).

*PF

This bit is set when the received parity disagrees with the programmed parity (EVEN
parity). The PF status is reset at the end of the next character if the failure condition
disappears. The P AS LA is normally programmed for no pa:L'ity checking (Bits 5 and 6 of
Command 2 = 00) so PF never sets.

*FRERR

This bit is set to indicate that the received character has no stop bits. If the assembled
character is zero, then a line break sequence is indicated. This occurs when the Break
Key is depressed. This bit resets only when a valid character with stop bits is received.

9

BSY

.When this bit is inactive, the device is rea.dy to transfer data. This bit is forced active if
the CRT Terminal is Off-Line. In the Read Mode, BSY is active when a character is not
.assembled; in the Write Mode, BSY is active if the CRT Terminal has not yet accepted
a character. If enabled, an interrupt is generated when BSY goes inactive. In the Read
mode, when an OV occurs and the BSY status bit is zero, a Read Data instruction must be
issued to set the BSY bit to its correct (ONE) state.

EX

This bit is set whenever OV, PF, or FRERR is set on the Receive side. This bit is always
zero on the Transmit side.

With PASLA, to determine whether the CRT Terminal is On-Line or not, the status of the Receive side must be examined.
If the status byte is 'oc' (BUSY and EX), a Device Unayailable condition is indicated.
*These status bits are set at End of Character time when BUSY drops. Since the resetting of BUSY causes an interrupt
(if enabled), these bits do not generate individual interrupts. At this point a Read Data instruction must be issued to
set the Busy bit to its correct (ONE) state.

COMMANDS
In the PASLA Command 1, the DTR, ECHOPLEX, and WRT/RD bits are shared by the Transmitter and Receiver, however, the EN/DIS bits are separate for Transmit and Receive. In FDX operation, the EN/DIS must be independently
programmed as follows. To change EN/DIS on the Receive side, issue a Command with the WRT/RD bit = O. To change
the EN/DIS on the Transmit side, issue a Command with the WRT/RD bit = 1.
CLK

Setting this bit selects the highest strapped clock rate. Resetting this bit selects the lowest strapped clock rate.

DATA BITS

These two command bits select the number of data bits transferred per character as follows:

STOP BITS

BIT 2

3

o

0

5 Data bits

o

1

6 Data bits

1

0

7 Data bits

1

1

8 Data bits

This command bit selects the number of stop bits transferred per character.
BIT 4

PARITY

10·

o

1 Stop bit

1

2 Stop bits

These two command bits select the parity checking logic in the P ASLA.
BIT 5

6

o

o

None

o

1

None

1

o

Odd

1

1

Even

The second PASLA command is shar8d by both the Transmit and Receive Sides, and consequently may be issued to either devIce number. The second command has the preferred
value of X'78' that conditions the PASLA to the following:
1. Highest strapped baud rate (9600 baud standard)

2. 8 data bits per character
3. No parity checking

4. Two stop bits
DISABLE

ENABLE

0

0

No change

0

1

Enable

1

0

Disable (Interrupt queued)

1

1

Complement (Change state)

TRANS LB

Transmit a continuous space (zero) to the Terminal. This bit should always be zero.

DTR

This bit must always be a one to enable character transfers between P ASLA and the CR T .

ECHOPLEX

When this bit is active, it causes data received from the CR T Keyboard to be transmitted
back to the CRT on the TRANSMITTED DATA (BA) line. The PASLA also assembles the
character as in the normal data mode. This feature is normally used to provide visual
verification of the data received by the CRT. This command must not be issued while
transmitting a character. When this bit is inactive, characters read from the Keyboard
are not displayed.

6. PROGRAMMING SEQUENCES
Care should be exercised when switching the PASLA from the Write Mode to echoplexed Read Mode. Any time such a
transition must be made, the last character output should be a rub-out (all ones). If not, the last character output may
be mutiliated. Switching from the Write Mode to the non-echoplexed Read Mode causes no problems.
Appendix 1 shows a sample program for transferring data from the CRT keyboard using the PASLA. Appendix 2
shows a sample p.rogram for transferring data to the CRT screen using the PASLA.
7. INTERRUPTS
An interrupt occurs, if enabled, when BSY - + o. If a character has ever been input or output, the PASLA will have
queued an interrupt whether interrupts were enabled or not.
Consequently, the programmer should always be prepared to ignore the very first interrupt received from either the
transmit or receive side. On the first interrupt, if the P ASLA status is only Busy, ignore the interrupt.
After outputting a last character, the programmer should wait for the final interrupt that occurs as soon as the P ASLA
finishes with the last character.
When switching Interrupt Enable from the transmit side to the receive side, an extra output command must be inserted
to restore the WRT /READ bit to zero. For example:
1. Output Command Receive side, Enable-Read

2. Output Command Transmit side, Disable Write
3. Output Command Receive side, Read

8. INITJALIZA TION
When the Initialize Switch on the Display Panel is engaged (or power failure restart sequence), the .PASLA is placed in
the Disable Mode. The OV, PF, and BRK status bits cannot be guaranteed. Because of this, the programmer should
take precautions to ignore these bits on the first interrupt. A Read Data (RD or RDR) should be issued to insure that
BSY is equal to a one (1).
9. DEVICE 'NUMBER
The PASLA is normally strapped for addresses X'10' and X'11'. The even address is for the Receive side and the odd
address is for the Transmit side.
10. SAMPLE PROGRAMS

See Section 6.
11..: TESTING
,The PASLA is tested independently at INTERDATA using the PASLA OFF-LINE TEST PROGRAM, 06-127.
and CRT Terminal are then tested together using the CRT TEST PROGRAM, 06-146.

12

The PASLA

APPENDIX 1.
SAMPLE PROGRAM'FOR DATA INPUT FROM THE KEYBOARD

*

SUBROUTINE INPUTS A CHARACTER FROM THE

*

CRT KEYBOARD. REGISTER DEVO CONTAINS

*

THE PAS LA RECEIVE ADDRESS (EVEN ADDRESS)

*
* :CALL IS:

BAL RET1, INPUT

*
INPUT

OC

DEVO, TREAD

SELECT ECHOPLEX READ

READ

OC

DEVO, SECOND

SET PASLA CONDITION

SENS

SSR

DEVO, STAT

SENSE STATUS

BO

STATER

BAD STAWS

BCS

SENS

BUSY, LOOP

RDR

DEVO,CHAR

INPUT CHARACTER

BAL

RET2, PARCHK

NHI

CHAR,X'7F'

REMOVE PARITY BIT

BR

RET1

REWRN

*

.1

TEST PARITY

INPUT CHARACTER IS IN REGISTER CHAR

*
DEVO

EQU

°

REGISTER

RET2

EQU

2

ASSIGNMENTS

STAT

EQU

9

CHAR

EQU

11

RET1

EQU

15

SECOND

DC

. X'7878'

TREAD

DC

*
*
X'B9B9'

A1-1/Al-2

APPENDIX 2.
SAMPLE PROGRAM FOR DATA OUTPUT TO THE CRT SCREEN

*

SUBROUTINE OUTPUTS CONTENTS

*

REGISTER CHAR TO THE CRT

*

REGISTER DEVI CONTAINS THE PASLA

*

TRANSMIT ADDRESS (ODD ADDRESS)

*
*

CALL IS: BAL RET2, OUTCHR

*
OC

DEVl, SECOND

SET PASLA CONDITION

OC

DEVl, TWRT

SELECT WRITE· MODE

SSR

DEVl,STAT

SENSE STATUS

BCS

SENSE

LOOP ON BUSY

WDR

DEVl,CHAR

OUTPUT CHARACTER

BR

RET2

RETURN

DEVI

EQU

1

REGISTER

RET2

EQU

2

ASSIGNMENTS

STAT

EQU

9

CHAR

EQU

11

OUTCHR

SENSE

*
*

*

*
SECOND

DC

X'7878'

TWRT

DC

X'ABAB'

A2-1/A2-2

APPENDIX 3.
SAMPLE PROGRAM FOR POSITIONING THE CURSOR

*

SUBROUTINE POSITIONS THE CURSOR TO

*

THE POSITION SPECIFIED IN REGISTER TAB

*
*

CALL IS: BAL RET1, SETCSR

*
LHI

CHAR , X'6C'
.,

LCA CODE

BAL

RET2,OUTCHR

OUTPUT IT

EXBR

CHAR, TAB

MS 8 BITS

XHI

CHAR ,X'7F7F'

ONES COMPLEMENT

B1\L

RET2,OUTCHR

OUTPUT COLUMN NO.

EXBR

CHAR,CHAR

LS 8 BITS

BAL

RET2,OUTCHR

OUTPUT LINE NO.

BR

RET1

RETURN

RET2

EQU

2

REGISTER

TAB

EQU

8

ASSIGNMENTS

CHAR

EQU

11

RET1

EQU

15

SETCSR

= COLUMN

= LINE

*
*

*
*
A3-1/A3-2·

APPENDIX 4.
SAMPLE PROGRAM FOR DETECTING THE CURSOR POSITION

*

ROUTINE READS THE PRESENT CURSOR POSITION

*

REGISTER DEVO CONTAINS PASLA RECEIVE ADDRESS

*

REGISTER DEV1 CONTAINS PASLA TRANSMIT ADDRESS

LHI

CHAR,X'6D'

RCA CODE

BAL

RET2,OUTCHR

OUTPUT IT

SSR

DEV1,STAT

BTBS

8,1

WAIT FOR OUTPUT

OC

DEVO, NEREAD

NON-ECHOPLEX READ

BAL

RET1,READ

READ FmST BYTE

LHR

TAB, CHAR

SAVE COLUMN NO.

BAL

RET1,READ

READ SECOND BYTE

EXBR

TAB, TAB

OHR

TAB, CHAR

COMBINE WITH LINE NO.

NHI

TAB, X'7F7F'

REMOVE PARITY BITS

XHI

TAB,X'7F7F'

AND ONES COMP

*
*
DEVO

EQU

0

REGISTER

DEV1

EQU

1

ASSIGNMENTS

RET2

EQU

2

TAB

EQU

8

STAT

EQU

9

CHAR

EQU

11

RET1

EQU

15

*
*
NEREAD

DC

X'A9A9'

A4-1/A4·-;~

APPENDIX 5.
SAMPLE PROGRAM FOR INPUTTING THE ENTIRE CR T SCREEN

*

THE OPERATOR HAS INDICATED THAT THE

*

PROCESSOR MAY READ THE ENTffiE CRT SCREEN

*
*

ROUTINE HOMES CURSOR THEN INPUTS CHARACTERS

*

TO A 1920 BYTE BUFFER UNTIL AN ETX

*

CODE IS RECEIVED.

*
*

CALL IS BAL RET1,RESCRN

*
RESCRN

XHR

TAB, TAB

LHI

CHAR,X'69'

BAL

RET2,OUTCHR

LHI

CHAR,X'7D'

BAL

RET2,OUTCHR

LHI

CHAR,X'6A'

BAL

RET2,OUTCHR

SSR

DEV1,STAT

BTBS

8,1

OC

"DEVO, NEREAD

CLEAR BUFFER INDEX

HOME CURSOR

KEYBOARD LOCK

XMIT CHARAC TER

. WAIT FOR CHARACTER
SELECT NON-ECHOPLEX READ

*
LOOP

SSR

DEVO,STAT

BO

STATER

BAD STATUS

BCS

LOOP

BUSY, LOOP

RDR

DEVO,CHAR

INPUT BYTE

BAL

RET2, P ARCHK

TEST PARITY

A5-1

>i'

PARITY OK, CONTINUE
NHI

CHAR,X'7F'

REMOVE PARITY BIT

STB

CHAR, BUFF(TAB)

STORE IT

AIS

TAB, 1

INCREMENT INDEX

CLHI

CHAR,X'03'

ETX?

BNE

LOOP

NO, LOOP

LHI

CHAR,X'70'

BAL

RET2,OUTCHR

KEYBOARD RELEASE

BR

RETl

RETURN

DEVO

EQU

0

REGISTER

DEVl

EQU

1

ASSIGNMENTS

RET2

EQU

2

TAB

EQU

8

STAT

EQU

9

CHAH

EQU

11

BET1

EQU

15

'"

'"

'"

>I-

>I-

NEREAD

DC

X'A9A9'

DUFF

DB

1920

'"
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NO CHG SEE

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D

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DCN

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02C

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SKB

9

SKO
SCAN 7
SCAN 2&6
lDSR

II
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63

SCAN A
CGtl
ENSPl
CSR BLINK
INHOSC
EXTOSC
HSYNC 1M)
PMRT
PMClK

C

2
4
6
8
10

TIME OUT
EOM
LDREG

....

65

B

67
69
71
73
75
77
79
81
83
85

CTR RST

-

+5'1

SCAN 6
SCANIS7
SCAN 3&5
lM Cll(
SCAN X
CGQJ2
HSYNC

30
32
34
PMRT
36
PMCLK
38 CHAR BLINK
40 EN EXT ClK
42
BLANK
44
46
48
50
52
54
56
58
60
62
64
66
68
70
72
DSPlCK
74
OSPCMPR
'76
78
80
82
84
86

lDLMSP
L.M-PM
ENlMCll(
PMClK

(M)

BL.ANK
PMII
PM12
PMI3
PMI4
PMl5
PMI6
PMI7

2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58

59 60
61 62
63 64
65 66
61 68
69 1'0
71 72
73 14
75 16
77 78
79 80
81 82
83 84
85 86

VIDEO (II)
COMP VIDEO

-uv
-12'1
GND

+5'1

I
3
5
7
9

+5'1

eSR CMPR
SKA
SKC
SCAN 4
SCAN la7
SCAN 365,
LII ClK

CLR CAH

2

6

SCAN X
CG'2
HSYNC
VSYNC
LO L.M
REC lM
PMCLK-L.M

13
15
17
19
21
23
25
27
29
31
33
35
31

SCANA

lDPM
lDUI.

PMCLK
~0fItI

EN EXT CL.K

39
41
43
45
47

PMJI
PMIZ
PMI3
PMI4
PMI5
PMI6
PMI1

PMOI
PM02
PM03
PM04
PM05
PM06
PM07

r---

-5'1

-12'.1
GNO

GND

16
18
20
22
24
26

P2

~3

LM S co

PM

(DrR)
(70A7AJ
[BOATAJ
, (DSROV)

zo . . .

~ e.::::::
-':-~1

i

.......

3
6.,

G-

LOPMSP

PMCLK
CHAR BLINk
EP

PMOi
PM02
PM03
PM04
PM05
PMOS
PM07
PROTECT
CM+MC

--5V~

GNO

14{JJA
./ 2{ca

w

17- 272c"RT- PASLA CABLE.

((

2
4
6
8
10
12
14
16
18
'20
22
24
26
28

30
32

3<4
36
38
40
42
44
46
48
50
52
54
56
5&
60
62
64
66
68
70
72
74
76
78
80
82
84
86

+!5v
CSRCMPRV

+5'1

+5'1
2
I
3
_CSRMPRV
EOl
5 6
CSRCMPR
EMPMClK
--7 8
CAV-I
CAV+I -.- .
9 10
ClR CAV
CLR CAH
'-~.
II
LD CAY
lD CAH
13 14 __ ~AH+I_
EN MAV+I
c-------------~
15 16
11 18
082
OBI
1--19 20
DB4
DB3
21 22
OB6
DB5
1--23 24
SPARE
DB8
DB7
25 26
27 28
29- 30

r-----=

-=--- --

CAV-I
ClR CAV
lD CAV
CAH+t -_.CAH-I
-DB2
.' DB4
DB6

'"

,'lDPMSP
lD lM
REC LM
PMCL.K-lM
PMRT
~
lST LINE
EN EXT elK
EP
..

~

SPARE ~TCH~ 31
PMRT
33
PM ClK
35
-37
39
. roii
41
43
CAH-IR
45
47
49
51
53
>--.
55
57
59
61
63
65
67

--

PROTECT
CM+MC
oeruLl

CTR RST

.~~

---

--

-.

---

GND

--

PArfA{f ~

.,;

I'.

I

6

I

5

_

DO _

t

4

I

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68
70
72
74
16
78
80
82
84
86

...

t~
J

54 - ..
56
58
60
62
64
66 .

.... ""NCH

V\.

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CSR3
CSR4
CSR5

i I~::T

OATA

CRT-MODEM CABLE.

f·

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CAV-IR

COUNTERS

(ROATA)2

'1

PMRT
PM ClK
lST liNE

52

69
71
73
15
77
79
81
83
85

(DTR)

r'T

32
34
36
3.
40
42
44
46
48
50

-~

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GND

c

~----.-.-

P4

V '
/iY\ ~I'

8

"

CONTROl

/Z{Cc .,
JS
;J/(88) ,

~
0

I

--

28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58

I
3
5
7
9

13
15
11
OBI
19
DB3
2.1
DB5
23
DB7
25
lO PM
27
lOlMSP
29
lD-PM
31
ENlMClK
PMRT
33
35
37
TIME OUT
39
EOM
41
lD REG
43
45
PM!I
47
PMI2
49
PM!3
51
PMI4
53
PMl5
55
PM 16
57
Prrn
59
61
DATA
RO EN CLR F 63
65
rUNC
67
69
LOCK
71
INHEDIT
73
75
77
19
MC
81
83
6NO
85

14~

PI

,

ClR CAV

49
51
53
55
51
59 60
61 62
63 64
65 66
67 68
69 70
71 72
73 74
75 76
77 78
79 80
81 82
83 84
85 86

lOCk
INHEOIT
DSPCMPR

ENPM~~

8
10
12

II

+5'1
EOL
CSRCMPR
CAV+I
ClR CAH
lO CAH
EN MAV+I

+5V

"

TI.MING ,GEN

7 .....

C

5
7
9
II
13
15
17
19
21
23
25
27
29
31
33
35
31
39
41
43
45
41
49
51
53
55
57

SCAN A
CGfll
ENSPl
CSR BLINK

VSYNC
TEST RST

28

I
3

02C
03C
SKB
SKD
SCAN 7
SCAN 2&6
lO SR

SKA
SI(C

12
14
16
18
20
22
24
26

".

A

+5'1
7MHZ

.

MMOWALlIllJ,ua)~

--..wt ALL EOQ€I AND

8MA,.c:oft.,.

2

nTUCARD CAGE
CONNECTIONS
400 SERIES

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V

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6

4

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REVISIONS
OEeC_'II'TIOIil

DCN

0
0

0)
0)
'--

A~.

11"

RELEASED
-B. NO CHG- SEE DCN
C NO CHG - SEE DCN
0
REV PER DCN
F.
NO CHG - SEE DCN
A

l'U6 '"";.,,

,-,..,.
DATa

"i"'{1I)

847. w.) rl'f?1
843gj ~c.... ~'fA;;
86080 ~W ~S"JIIL ~

o

o

SPARE

B

+5V
EOL
CSRCMPR
CAV+I
CLRCAH
PRTCODE
00-4
00-5
081
OB3
OB5
OB7
SI
CI

I
3
5
7
9
II
13
15
17
19
21
23
25
27
29
31
PRT BSY
PMRT
33
35
37
TIM~ QUT
39
EOM
41
LO REG
43
CAH"'IR
45
CSRI
47
CSR2
49
CSR3
51
CSR4
53
CSR5
55
CSR6
57
eSR7
59
ill-I
61
Di:fA
RD r:N ~lR F 63
65
FUNCT
67
10-3
69
lOCK
INHEDIT
71
73

SEG MODE
MC
+-9V

-12V
GNO

75
77
79
1\
83
85

2
4
6
B

10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
66
68
70
72
74
76
78
80
82
84
86

P6

+5V
00-1
00-2
00-3
CLRCAV
LOCAV

+5V

II

CAH+i

13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45

CAH-I

OB2
OB4
086
DB8
00-6
00-7
00-8
OA
PMRT
ODR
LST LINE
EN EXT CLK
BELL
CAV-IR
PMOI
PM02
PMO!
PM04
PM05
PM06
PM01
PM08
PROTECT
10 2
OBFULl
10-4
ID-8
10-6
10-7
10-8

~7

49
51
53
55
!l7
59
61
63

~

TI5Jf
XMIT
-5V
CHASSIS GND

I
3
5
7
9

GND

2
4
6

+5V

+5V
AOR-O
ADR-I
AOR-4
AOR-5

e
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
66

6&
67 68
69 70
71 72
n 74
75 76
77 78
79 80
81 12
1!l3 84
85 86

AOR-2
AOR-3

--

PR

BUSY

EIA OUT

IO-I
10-2
10-3
IO-4

ID-5
IR

w--,

§!IJ

iU~15!

il

IDA
XiiTT
-12V
GND

GND

P7

I
3
5
7
9
II
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
!I!
55
57
59
61
&3
6!1

67
69
71
1'3
7&
77
79
81
83
85

10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
SO
52
54
56

+5V

+5V
00-1
00-2
00-3

2
4
61
Ii -1'
..

0D'"=4
015-5

l'iAiN

00-6
00-7
Tll OUT
OA
~

OOR

OSC
I
2
3
4
5
8

7

58

60
82
64
66
68
70
72
74
76
78
80
82
84
86

ffi-IN

Me

-5V
CHASSIS GHO

GND

I
:5
5
7
9
II
13
15
17
1921
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63
65
87
69
71
73
7&
77
79
81
85
85

2
4
6

+5V

+5V

I
3
5
7
9
II
L3
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63
65
67
69
71
73
75
71
79
81
85
15

CsRCMPR
CAV+I
CLRCAH
PRTCODE

e
10
12
14
16
18
20
22
24
26
28
30
32
3.,
36
38
40
42
44
46
48
50
52

--

_.
_s

:HAR

Pflt ClK
~

EOM

..

1--

54

56
58
60
62
64
68

,.....

81

70
72
74
76
78
80
82
84
86

SEG MODE

1iC
GNO

GNO

+5V

CLRCAV
CAH+I
CAH-I
:.

c
PRT BUSY

LST LINE
HLO

PMOI

Pii02
PM03
PM04
PM05
PM06
PM07
PMOS
PROTECT

SPARE

B

CHASSISGNO

PIO

P9

P8

2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
SO
52
54
56
58
60
62
64
66
lSI
70
72
74
76
78
80
82
84
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THESE DRAWINGS. THEIR DESIGN, DETAIL AIIID
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DASH NUMBER AND REVISION LEVEL TO BE
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PUBLICATION COMMENT FORM
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Date ________________

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Publication Title ____________

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Company ___________________ Publication Number _ _ _ _ _ _

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'"
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FOLD

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Check the appropriate item.
Error (Page No. __ , Drawing No. _ _ _ _ _ )
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