Plexus_P15_P20_Brochure_1985 Plexus P15 P20 Brochure 1985

Plexus_P15_P20_Brochure_1985 Plexus_P15_P20_Brochure_1985

User Manual: Plexus_P15_P20_Brochure_1985

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P/15-P/20

Plexus
Computers,
Inc.

Computer Systems
Models 1015A/1020A

The Plexus P / lS and P / 20 are powerful 16/ 32-bit super micmcomputers specifically designed for the
popular UNIX operating system.
The PIlS supports 8 usel's and the P / 20 with the addition of the Intelligent Communications Pmcessor
(rCP) extends this configurability to 16 users . Both are
ideal for applications that demand high pmcessor
peIformance and fast tem.inal J'esponse. They offer
superior pel'formance, reliability, and industrystandard haJ'dware and software inteIfaces for maximum OEM flexibility.
Both systems employ a powerful micmpmcessor
design featuring two MC68010 micmpmcessors, a
large main memory, and a wide selection of industrystandard S.2S-inch peripherals with high speed intelligent contmllers. This design closely links the
multiprocessor architecture with a tuned implementation of the UNIX operating system to ensure maximum multiuser pelformance.
For enhanced OEM flexibility, the systems use the
industry standard Small Computer Systems Interface
(SCSI) for connecting periphel'al devices. This allows
them to be configured with a wide range of Winchester disks, floppy disks and cal'tddge tape drives.
The P / lS and P / 20 run SysS.2, the Plexus implementation of UNIX system V release 2, along with many
industry-standard pmgramming languages, making
them compatible with a wide variety of existing applications. They are software compatible with all other
members of the Plexus family allowing a smoo th
upgrade path as computing requirements expand.

FEATURES
Performance
D Multipl'ocessor architectul'e
D High performance 68010 processors
D Up to 2 Mbytes of main memory
D Dedicated 68010 110 pmcessOl'
D Full SCSI disk inteIface
D Up to 152 Mbytes of Winchester disk storage
D Floppy disk standard
D Streaming cartddge tape optional
Reliability

D Pal'ity en'or contml in main memory
D Ermr checking and con'ecting disk memory
D Extensive use of VLSI circuitry

D
D
D

10,000-hour MTBF disk drives
UNIX SysS.2 operating system
Modular design for easy service

Compatible Hardware
D Industly-standard pel'iphel'al inteIfaces
D Industry-standal'd communica tion s
Standard Software

D SysS.2 runtime opel'ating system
D Industly-standard languages
Designed for the Office
D Quiet
D Compact size, office compatible
D Uses standard AC power

MULTIPROCESSOR DESIGN
The high performance of the machines is made possible by a special multipmcessor architectul'e optimized for the UNIX opemting system.
The architectul'e links a powerful 16/32-bit job
pmcessor with a second 16/32-bit 110 pmcessor of
equal power to remove 110 pmcessing overhead fmill
the job pmcessor. During system operation, the job
pmcessor peIfOl'ms application processing and operating system functions while the second processol'
supervises all disk and magnetic tape 110 as well as
handling the tl'ansfer of all data thmugh the serial lIO
ports.

J
i

PERFORMANCE PERIPHERALS
SCSI Peripheral Bus
The P / lS and P / 20 incorporate a full implementation
of the state-of-the-art Small Computer Systems Intel~
face as the pel'ipheral bus in the system. This ANSI
standard bus is modeled after similar implementations that are widely used in large mainframe computers. The SCSI bus allows attachment of a wide
variety of mass storage devices via intelligent full buffered contmllers that interface each device to the SCSI
bus. Each device contmllel' gains control of the SCSI

2

bus when it wishes to transfer data. The data is transferred to or from main memory via a DMA operation
on the I/O bus. This architecture insures optimum use
of all devices on the bus regardless of their speed. In
addition to its performance advantages, SCSI provides
device independence by· allowing the Job and 110
processors to address the peripherals with standard
high-level commands.
Fast, High-Capacity Disk Drives
The disk subsystems consist of one or two 5.Z5-inch
Winchester disk drives. The drives can be chosen from
a family with a wide range of capacities and access
times.
Cartridge 'Thpe Drive
When high speed capacity disk backup is required,
the system can be configured with a 45 Mbyte streaming tape drive. The cartridge tape can be used in place
ot or in addition to, the standard floppy disk unit.

BUILT-IN RELIABILITY
The PI15 and P/ZO design addresses the most common of computer system failure and employs safeguards against loss of data insuring maximum system
reliability.

RAM Memory and Disk
The system utilizes high-reliability hermetically
sealed memory chips for maximum MTBF of the main
memory subsystem. Parity error control consisting of
one bit for each byte of main memory insures detection of single-bit data errors. The disk controller
protects the data integrity of each sector with a 3Z-bit
ECC (error correction code) allowing data errors up to
11 bits in length to be detected and corrected. This
correction is handled automatically by the controller
such that only errop-free data reaches main memory.
Thmperature and Power
The machine also allows the connection of an Uninterruptible Power Supply (UPS) between itself and the
AC main power. The UPS allows normal operation to
continue during brief power outages and provides for
an orderly shutdown during lengthy power failures.
If the internal temperature should pass a predetermined threshold, an over-temperature sensing circuit
alerts the job processor and an orderly shutdown may
be initiated to save all data before a critical temperature is reached and a system failure results.

P/15-P/20 System Architecture

r----------------------------------,

I6-Bit
Intelligent
Communications

Job Processor Bus

System
DRAM
Memory

MemOlY
Map

Other
Multibus

Other
Multibus

I

I

Serial
110
8 Ports

SCSI
Interface

IL _______________________________
P/20 Only
J

3

VLSI and LSI Circuitry
Extensive use is made of state-of-the-art VLSI and LSI
circuits to minimize the number of components used,
resulting in an inherently more reliable system. In addition, the cabinet is designed to channel cooling air
to all parts of the system enclosure thus minimizing
component heating and maximizing component life.
Sell 'lest, Easy Repair
The P/15 and P/20 subject themselves to a comprehensive set of diagnostics every time they are powered
on. These tests exercise every major subsystem including both processors, main memory, and all peripheral device paths.
Repair of the machines is facilitated by modular
design and construction that begins with the easy access cover design that allows removal of the entire
system outside cover with only two screws. All system
modules, including the single-board of systems, are
easily accessible for testing or replacement.

DESIGNED FOR THE OFFICE
The P 115 and P 120 are designed for ease of integration
into the office environment. The dimensions of the
system enclosures allow placement of the system in a
variety of locations which include both under work
tables and adjacent to desks. The systems have been
engineered to emit very little sound so as to minimize
the impact on office environment sound levels. The
enclosure design is modern and the neutral colors
blend well with any office decor.

liD Processor
Processor
Performance features
PROM memory
Static RAM
Address space
Self-test

16/32-bit MC68010
12.5 MHz CPU clock
64 Kbytes
16 Kbytes
8 Mbytes
Standard, via on-board
PROM

P/15-P/20 Communications Standard

Serial ports

8 (full-duplex) standard;
all RS-232C 19.2 Kbaud
rate

P/.20 liD Bus

Bus Standard
Available Slots

Multibus (IEEE 796)
3 (max.)

P 1.20 Communications Option
Intelligence
Memory
Serial ports

Parallel ports
Configurability

16-bit processor
32 Kbytes RAM (with
parity); 16Kbytes PROM
8 (full duplex); RS232C interface; 19.2 Kbaud rate
(max.); modem support
on all ports; hardware
support for async and
bisync protocols
1 Centronics-type
interface
ICP (max.)

SCSI Interface P/15-P/.20
SPECIFICATIONS

Subsystem interface
Major functions

Job Processor
Processor
Performance features

User Address space
Floating-point
Clockl calendar
Self-test

16/32-bit MC68010
12.5 MHz CPU clock
Operates with no wait
states
Shared high speed
memory map
8 Mbytes
Conforms to proposed
IEEE standard
Battery-powered
Standard, via on-board
PROMs

Memory
Capacity
Word size
Access
Technology
Cycle time

Up to 2 Mbytes
16 bits plus 2 parity bits
Job processor bus or 110
processor bus
256K-bit DRAM
320 nsec

SCSI (ANSI x 3T9.2/822)
Error checking and
recovery; full SCSI
interface functions,
multiple channel DMA
controller

Winchester Disk Subsystem
Drive interface
Host interface
Configurability
Subsystem capacity
Disk drive options:
Formatted capacity (Mb)
Positioning time (msec)
Rotational latency (msec)
1ransfer rate

ST506 compatible
SCSI
2 drives per system
(maximum)
152Mb (maximum)
12' 24 28
49
33
83
83
33
8.3 8.3 8.3 8.3
625 Kbytes/sec
'P115 only

76
33
8.3

4

SPECIFICATIONS (cont.)

PHYSICAL CHARACTERISTICS

Floppy Disk Subsystem

Overall Dimensions

in.

cm.

Width
Depth
Height

9.75
24
24

25
61
61

Disk drive

Drive interlace
Host interlace
Configurability
Formatted capacity
Positioning time (msec)

5.25-in. floppy
96 tracks per inch
Double sided double
density
SA451 compatible
SCSI
1 per system
640Kbyte
94

Thpe Subsystem
Thpe drive
Recording density
Streaming speed
Formatted capacity
Subsystem interlace
Controller interlace
Recording format
Configurability

Streaming cartridge (3M
style)
8000 bpi, 9 tracks
90 ips
45 Mbytes
SCSI
QIC-36
QIC-ll
1 drive per system

115 VAC

Line voltage
Line frequency
Current (max.)

115 VAC±10% 230 VAC±10%
60 Hz±5%
50 Hz±5%

Plexus
Computers,
Inc.

Weight
Audible noise
Heat dissipation
Operating
Temperature range
Relative humidity
Regulatory approvals
Altitude
Storage temperature
range

70lbs.
32 Kg
< 50db (A)
1710 BTU/hr 431 KcaVhr
41F-95F degrees
5C-35C degrees
up to 90% noncondensing
UL, CSA, FCC, TUY, VDE
up to 10,000 feet
-40F-149F degrees
-4°C-85C degrees

UNIX is a trademark of AT&T Bell Laboratories.
Specifications subject to change.
Plexus is a trademark of Plexus Computers, Inc.

230 VAC

AC Power Required

IPILlEXIU~

Other Characteristics

3833 North First Street
San Jose, CA 95134
408 • 943 9433
TWX/TELEX 910338 2223

© 1984, 1985, Plexus Computers, Inc.
7.5Kl185
Printed in U.S.A.
BB4?



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