GEC 4000 Computer
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
installation.pdf User Hardware Handbook
processor_performance.pdf User Hardware Handbook
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
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This exhibit has a reference ID of CH2071. Please quote this reference ID in any communication with the Centre for Computing History.
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