Digital Equipment Corporation PDP-7A Serial number #104 - Massachusetts Institute of Technology (project MAC)

Digital Equipment Corporation PDP-7A - S#104
Massachusetts Institute of Technology project MAC

S#104 Image courtesy of Computer History Museum, click for larger image

S#104 in manufacture.
Image ©2009 Computer History Museum

The PDP-7 Service list (1972) lists that machine #104 was shipped to the Massachusetts Institute of Technology project MAC in January 1966 and consisted of the following options -

Option	S#	Ship	DEC #	Notes
149B	000055	0166	999999	4k memory upgrade to 8k
177B	000003		000048	Extended arithmetic element
637	000057	0766	042540	Bit synchronous data communication system
KA71	000002		000000	I/O device package
KA77	000002		000000	Processor unit

For descriptions of the above options see the full PDP-7 options list here.

120 PDP-7 and PDP-7A systems were forecast to be built in total, but at this time we do not have any information about the possible remaining 21 systems or who they were delivered to. The 18-bit service list, available here (6.5Mb pdf), details the 99 known PDP-7 and PDP-7A systems in the list at that time. The PDP-7 appeared to have sold well into Government research and University sectors with 11 systems shipped to the UK alone, almost 10% of the forecast production run !. Serial numbers are concurrent for both PDP-7's and the PDP-7A's, so the missing 21 could be of either type, however we are reasonably confident that the 99 systems shipped were the only ones ever built.

If you know of any information about any of the PDP-7 systems worldwide, options, location of existing systems, spare parts, ancillary bits, software, tapes or manuals, then please let us know here.

Documents associated with PDP-7 S#104 - None at this time

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