GEC 4000 Computer

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Although we do not have a working model of a GEC 4000 computer, we have been lucky to obtain electronic copies of the following documentation.

Just click on the following files to get the PDF file

cmu.pdf Users Hardware Handbook
Central Processor Unit
Controls and Monitoring

instruction_set.pdf User Hardware Handbook
Central Processor Unit Instruction Set

nucleus.pdf User Hardware Handbook
Central Processor Unit Nucleus

bmc.pdf User Hardware Handbook
C.P.U. Basic Multiplexer Channel

interfaces.pdf User Hardware Handbook

part_of_gec_brochure.pdf Part of GEC 4000 Computer Brochure

system_description.pdf User Hardware Handbook
System Engineering
System Description

installation.pdf User Hardware Handbook
System Engineering

processor_performance.pdf User Hardware Handbook
System Engineering
Processor Performance

board_index.pdf Board Patching/Positioning/Alternates

cover.pdf 2050/4000 series
Patching & Hardware Settings

misc_boards.pdf Miscellaneous Boards

way_ready_patching.pdf Way & Ready Patching

The arrival of the more powerful 16-bit 4000 series is 1973 gave GEC Computers a basis for a much wider attack on the market. The opportunity to build on the 4000 series was helped by two important factors - public sector bodies, such as the Post Office and universities, are directed to buy British; and it had a ready made market within the GEC group, whose members are encouraged, although not compelled, to buy from GEC Computers.

GEC Computers traditionally has strong links with the university market, providing front-end computers for the ICL 1900as well as stand-alone machines. More recently its involvement with the EPSS packet-switching system and Prestel have involved a number of Post Office contracts for 4000s. the order book for 4000s stands at 260 systems with 200 installed.

Links for further information:

We gratefully thank Mr Alan Harradence - Senior IT Technician at the Sir George Monoux College in Walthamstow, East London - for the data and information

Manufacturer: GEC
Date: 1973

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GEC 4000 Computer Articles:

Item Manufacturer Date
Peter Guest: Reminiscence written by Margaret Guest 2021

Magazines RELATED to GEC 4000 Computer in our Library

Item Manufacturer Date
SERC Bulletin Summer 1983 1983
Dragon User - September 1984 1984
Dragon User - December 1984 1984
Dragon User - August 1984 1984
Practical Computing - June 1984 Jun 1984
Acorn User - June 1986 Jun 1986
Official Nintendo Magazine - November 1998 EMAP Nov 1998
N64 Magazine - November 1998 Future Publishing Nov 1998
Computer and Video Games - January 1999 emap active 1 Jan 1999
Total Control - May 1999 Rapide Publishing Mar 1999
Computer and Video Games - May 1999 emap active 1 May 1999
N64 Magazine - Christmas 1999 Future Publishing Dec 1999

Catalogues RELATED to GEC 4000 Computer in our Library

Item Manufacturer Date
GEC Plessey Semiconductors 1992/93 1992

Other Systems Related To GEC 4000 Computer:

Item Manufacturer Date
GEC 4080 Computer GEC 1976
GEC 4100 Computer GEC 1985

This exhibit has a reference ID of CH2071. Please quote this reference ID in any communication with the Centre for Computing History.


GEC 4000 Computer

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