IBM 7094 Simulator Configuration

The IBM 7090 (and its successors, the IBM 7094 and 7094 Mark II) were the culmination of IBM's line of 36b scientific computers, which began with the IBM 701.  They were the standard for scientific computing, and the peak of IBM's product line, until the introduction of the System/360 in 1964.

MIT used a modified IBM 7094 as the basis for one of the earliest and most influential time-sharing systems, CTSS (the Compatible Time-Sharing System).  CTSS was used at MIT, and at Project MAC, until 1971, when it was superceded by the GE 645 used for Multics.




CPU and memory

IBM 7090 or 7094


CTSS special features          

expanded memory         

real-time clock
Chronlog (time of day) clock
memory protection and relocation
Channels 7607 channel 1-8
7909 channel 0-3
Cards 711 card reader

721 card punch

Line printer 716 line printer
Magnetic tapes 729 Mark II, IV, or VI 10-80 drives


7750 terminal concentrator

33 lines
Disk drives 1301 disk drive up to 10MW
1302/2302 disk drive up to 20MW



up to 200KW

7320A (7289)


Updated 08-Aug-2020 by Bob Supnik (simh AT groups DOT io - anti-spam encoded)