ICL 1900 Series Computers

ICL 1906A Processor

Photograph courtesy Atlas Computer Laboratory, Chilton

Details of the ICL 1906A system at the Atlas Computer Laboratory - Science Research Council - Chiltern

• 1906A with
  • 256K 650ns store with Paging Unit
  • extended Ppecision Floating Point Unit
  • 1 high-speed channel
  • 5 extra slow channels
• 2 x 2581 2Mch High Speed Drum (connected via high-speed channel)
• 1 x 420Mch Bryant Fixed Disc File with controller
• 1 x 5 Spindle EDS60 Exchangeable Disc File (60Mch) with a 416Kch/sec instantaneous transfer rate per drive
• 1 x 9 Spindle EDS30 Exchangeable Disc File (30Mch) with a 416Kch/sec instantaneous transfer rate per drive
• 2 x 2505 (4 deck cluster) 9-track magnetic tape unit 1600bpi Phase Encoded 160Kch/sec transfer rate
• 2 x 1973 (2 deck cluster) 7-track magnetic tape unit 200/556/800bpi NRZI 15/42/60Kch/sec transfer rate
• 2 x 2101 Card Reader (with binary image) 80-column 1,600 cards/min
• 1 x 1920 Card Punch 80-column 100 cards/min
• 2 x 1916 Paper Tape Reader 8-track 1,000 ch/sec
• 1 x 1925 Paper Tape Punch 8-track 110 ch/sec
• 2 x 1933/3 Line Printer 160pp 1,350 line/min
• 1 x 7903 Communications Processor (and ancillary equipment) with
  • 32 keyboard terminals (MOP)
  • 10x7020 RJE terminals (card reader/line printer)

A total of 38 devices connected via 1 high speed channel and 16 slow channels.