page_title: ICL DRS
section_title: DRS 20/100/200
hierarchical_section_title: ICL DRS / DRS 20/100/200
caption_attribution_description: English: The ICL DRS20 Computer terminal, as on display at Bletchley Park in the United Kingdom. Deutsch: Die ICL DRS20 Computer-Terminal, das auf dem Display in Bletchley Park in das Vereinigte Königreich. Français&#160;: Le terminal informatique ICL DRS20, qui est exposée à Bletchley Park au Royaume-Uni.
context_page_description: The ICL DRS was a range of departmental computers from International Computers Limited. Standing originally for Distributed Resource System, the full name was later dropped in favour of the abbreviation.
  During the mid-1980s separate Office Systems business units had produced a disparate range of products including IBM-compatible PCs such as the PWS, small servers branded DRS, and various larger Unix servers sold under the Clan range. A rebranding in late 1988 pulled these together under the DRS brand, with a consistent mid-grey and peppermint-green livery.
  The ICL division responsible for these systems eventually became part of the Fujitsu-Siemens joint venture.
context_section_description: The original DRS was the DRS 20 produced in Utica, New York and launched in September 1981. This ran the proprietary DRX (Distributed Resource Executive) operating system. The basic 'intelligent terminal' (model 10/110/210) used 8-bit 8085 processors (workstation, application and network processors), each with between 32 KB and 128 KB of memory. The Model 210 also had an 80188 application processor with 512 KB to run CP/M. The larger models 20 and 40 had floppy disk drives. The floor-standing models 50, 150, and 250 had hard disks, from which diskless models booted. In early models, these were 8" floppy disks, and later 5¼" disks.
  The diskless model, that partnered the DRS 20, was the DRS 10. It had 10 KB available for applications programs developed in CIS COBOL.
  Up to 16 DRS 20/DRS 10 machines could be connected via LAN with the addresses being set by DIP switches on the rear of the unit. The LAN was formed via 93 Ohm coaxial cable in a bus formation running at 1.25 Mbps.
  The final model 310 (styled like a DRS 300 module) had a second 80186 application processor with 1 MB RAM to run Concurrent DOS, emulating an IBM PC with a Hercules screen display.
caption: An ICL DRS20 terminal
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