RS STE PA Processor A Single-Board Computer

The RS PA board is a complete computer system on a single Eurocard. it is based on the 4MHz Z80A microprocessor.and it runs CP/M Plus, the latest version of the CP/M operating system. The only extras you need are disc drives, a terminal and a power supply. The board also has a complete STEbus interface enabling memory and extra I/O to be added, so that the system can be expanded to a powerful industrial control system or a scientific computer with a vast range of CP/M software. CP/M Plus and suitable 31/2" and 51/4" disc drives are available separately (see the current RS catalogue). Note that it is not possible to make CP/M run on any arbitrary disc drive: the drive characteristics must be incorporated both in CP/M itself (in the BIOS, the hardware specific part of CP/M) and in the "boot" EPROM that the RS PA uses on power-up to load CP/M from disc. For this reason, only drives compatible with RS drives are supported. Of particular importance are the step rate, number of tracks and disc size.

There is a great deal of electronics on the RS PA board. The Z80A runs at 4 MHz, and can access the 64K of fast dynamic RAM with no wait states. An EPROM of up to 32K,can be switched in and out of the memory map under software control, and bank-switch bits can be used to access up to 192K of extra memory via the STE bus interface.

There are several I/O devices on board. Serial communications are handled by a Zilog SCC Serial Communications Controller and RS232 buffers. One channel is normally used by the system console device,for example a Video Display Terminal (VDT or VDU),and the other channel is configured as the system list device, for use with a serial printer. The baud rates on both channels can be set by a CP/M utility program and the standard boot EPROM contains a program for automatically finding the baud rate of the system console device and running at that speed. There is also a parallel latched input port which can be used by a parallel keyboard, although this is not supported in the standard BIOS. For modification details consult the RS CP/M Plus User Manual Supplied with the CP/M Plus software.
The disc controller is an advanced single-chip design that will control double density, double-sided disc drives with 80 tracks per side (RS FD35F or RS FD55F).

The STE bus interface allows the RS PA to act as the default bus master. Because the STE bus is multiprocessing, up to three masters can use the bus. This means that up to two potential masters may be added. The RS PB boards may be configured as potential bus masters.

There is a large range of I/O boards for the STE bus. Consult the current RS catalogue for details of analogue and digital I/O, memory expansion, EPROM programmers and STE hardware.

Complete withManual reference 631-862

Manufacturer: RS
Date: March 1986

RS STE PA Processor A Single-Board Computer Manuals:

Item Manufacturer Date
Jupiter Ace Forth Programming The Leagrave Press
Olivetti DE 520 System General Manual Olivetti
GEC 4080 Technical Description Issue 3 March 1974
GEC 4080 Technical Description Issue 4 June 1975
Intersil Intercept Jr Tutorial System - Owners Handbook Intersil 15-11-1976
SC/MP Processor Applications Handbook (MK14) National Semiconductors 1977
IBM - VSPC FORTRAN General Information IBM August 1977
Hawk microcorrputer Manual Hawk 1978
TMS 9900 Microprocessor - Assembly Language Programmer's Guide Texas Instruments 15-10-1978
Spellbinder Manual for version 5.12 Spellbinder July 1982
Mentec - PDP-11 Macro-11 Language Reference Manual Mentec / Digital Equipment Corporation May 1988
IBM - Device Support Facilities: User's Guide and Reference - Release 13 IBM March 1991

Magazines RELATED to RS STE PA Processor A Single-Board Computer in our Library

Item Manufacturer Date
ULCC News October 1986 Newsletter 203 October 1986

Other Systems Related To RS STE PA Processor A Single-Board Computer:

Item Manufacturer Date
Acorn BBC Micro Model A (Issue 2 Board) Acorn Computers Ltd Unknown
Acorn AEH02 Archimedes NSM Acorn Computers Ltd Unknown
Busicomputers Prophet 3 Acorn Computers Ltd Unknown
Acorn System 4 Acorn Computers Ltd Unknown
Acorn System 5 Acorn Computers Ltd Unknown
Acorn Electron (Trial ROM) Acorn Computers Ltd Unknown
Acorn System 1 Acorn Computers Ltd Unknown
EDSAC II Cambridge University 1958
Intercept Jr Tutorial System Intersil 1976
Acorn 6502 Microcomputer Board Acorn Computers Ltd 1979
Acorn System 1 Acorn Computers March 1979
Open University Hektor I Open University 1981
Open University Hektor II Open University 1982
Open University Hektor III Open University 1982
Enigma - Galaxy 2 Computer Gemini Microcomputers 1983
Oric 1 48k Tangerine Computers 1st January 1983
Oric 1 16k Tangerine Computers 1st January 1983
Camputers Lynx 48 Camputers March 1983
Camputers Lynx 96 Camputers September 1983
Enterprise 128 - One Two Eight Enterprise Computers 1st January 1984
Acorn BBC Domesday System Acorn Computers Limited 1986
Control Universal EuroBeeb Control Universal Ltd 1986
Acorn Econet Terminal Acorn Computers Ltd 1986
Acorn - BT Merlin M2105 Acorn Computers / British Telecom 13th May 1986
Acorn Archimedes 440 Acorn Computers July 1987
Cambridge Z88 in prototype Optimus Case Cambridge Computers 1988
Acorn Archimedes A440/1 Acorn Computers May 1989
Acorn R260 Acorn Computers 1990
Higrade HIG-286-20 Higrade Computers 23rd January 1991
Torch Graduate Torch Computers PLC 1995
Acorn Stork Notebook Acorn Computers Ltd 1996
Acorn Fast NC - Serial Number 1 Acorn Computers Ltd 1997
Mac Mini A1103 Apple Computers 22nd January 2005

This exhibit has a reference ID of CH16777. Please quote this reference ID in any communication with the Centre for Computing History.

 

RS STE PA Processor A Single-Board Computer


Click on the Image(s) For Detail


User Submitted Articles


Add Your Article >>>

Related Video

Steve Furber Interview - 17-08-2009
Steve Furber Interview - 17-08-2009

Steve Furber Talk - Acorn World - 13-09-2009
Steve Furber Talk - Acorn World - 13-09-2009

Founding Sponsors
redgate Google ARM Real VNC Microsoft Research
Heritage Lottery Funded
Heritage Lottery Fund