SDS 940 Time-Sharing System, originally the Berkeley Timesharing System
CPU
Transistor[1] based custom 24-bit CPU
Memory
16 and 64 kilowords of 24 bits + parity, additional 4.5 MB swap[2]
Storage
96 MB at 117 kB/s, access time 85 ms[2]
Graphics
Instructions of beam motion, character writing, etc, 20 characters per second. 1000-character terminals with 875-line screen.[2]
Connectivity
Paper tape, line printer, modem
The SDS 940 was Scientific Data Systems' (SDS) first machine designed to directly support time-sharing. The 940 was based on the SDS 930's 24-bit CPU, with additional circuitry to provide protected memory and virtual memory.
It was announced in February 1966 and shipped in April, becoming a major part of Tymshare's expansion during the 1960s. The influential Stanford Research Institute "oN-Line System" (NLS) was demonstrated on the system. This machine was later used to run Community Memory, the first bulletin board system.
After SDS was acquired by Xerox in 1969 and became Xerox Data Systems, the SDS 940 was renamed as the XDS 940.
^Laws, United States Congress Senate Committee on the Judiciary Subcommittee to Investigate the Administration of the Internal Security Act and Other Internal Security (1975). Terroristic Activity: Hearings Before the Subcommittee to Investigate the Administration of the Internal Security Act and Other Internal Security Laws of the Committee on the Judiciary, United States Senate, Ninety-third Congress, Second Session ... U.S. Government Printing Office. p. 513. (...) XDS-940 computer is a second generation computer (...)
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The SDS940 was Scientific Data Systems' (SDS) first machine designed to directly support time-sharing. The 940 was based on the SDS 930's 24-bit CPU,...
includes the SDS 910, SDS 920, SDS 925, SDS 930, SDS940, and the SDS 945. The SDS 9300 is an extension of the 9xx architecture. The 1965 SDS 92 is an incompatible...
commercialized in the SDS940. It had additional hardware for relocation and swapping of memory sections, and interruptible instructions. The 940 would go on to...
the Berkeley Timesharing System, which was then commercialized as the SDS940. Project Genie was funded by J. C. R. Licklider, the head of ARPA's Information...
part of Project Genie and marketed by Scientific Data Systems for the SDS940 computer system. It was the first commercial time-sharing which allowed...
Kline connected from UCLA's SDS Sigma 7 Host computer (in Boelter Hall room 3420) to the Stanford Research Institute's SDS940 Host computer. Kline typed...
The SDS Sigma series is a series of third generation computers that were introduced by Scientific Data Systems of the United States in 1966. The first...
press a key to view the application's status. BBN Lisp which runs on an SDS940 had a status key which was implemented in the Lisp which ran on an OS,...
developed the Berkeley Timesharing System for Scientific Data Systems' SDS940 computer. After completing his doctorate, Lampson stayed on at UC Berkeley...
initially focussed on the SDS940 platform, initially running at University of California Berkeley. They received their own leased 940 in mid-1966, running...
was not designed as a multi-user operating system. It was much like the SDS940, but "the set of processes in the THE system was static". The THE system...
about 200 SDS-930/940/945 computers still installed. SDS 9xx computers Keith G. Calkins (June 1984). "The COMPUTER That Will Not Die: The SDS SIGMA 7"...
paging include the IBM M44/44X and its MOS operating system (1964), the SDS940 and the Berkeley Timesharing System (1966), a modified IBM System/360 Model...
Internet. To work on the project, Hardt-English obtained an expensive SDS-940 computer as a donation from TransAmerica Leasing Corporation in April 1972...
RCA. March 1968. pp. 5–6. Retrieved August 15, 2013. Reference Manual, SDS940 Computer (PDF). Scientific Data Systems. 1966. pp. 8–10. Hardware Engineering...
keyboard and mouse at the Civic Auditorium to their Menlo Park headquarters' SDS-940 computer. In order to provide live two-way video between the lab and the...
in August 1971. It was written in Tymshare's own SUPER FORTRAN on the SDS940. It offered basic single-file, non-relational database functionality using...
addresses. Some earlier systems with smaller real memory sizes, such as the SDS940, used page registers instead of page tables in memory for address translation...
both Intel 8080 and Zilog Z80 versions Nord-100 LGP-30 LGP-21 Sage II SDS940 SWTPC 6800 SEL-32 both Concept-32 and PowerNode systems Sigma "Preserving...
company, selling computer time and software packages for users. It had two SDS/XDS 940 computers; access was via direct dial-up to the computers. In 1968, it...
follow-on project called PILOT, for various computers of the time such as the SDS940. A line of PILOT code contains (from left to right) the following syntax...
Global Information