<computer> Programmed Data Processor model 10.
The series of mainframes from DEC that made time-sharing real. It looms large in
hacker folklore because of its adoption in the mid-1970s by many university
computing facilities and research labs, including the MIT AI Lab, Stanford, and
CMU. Some aspects of the instruction set (most notably the bit-field
instructions) are still considered unsurpassed.
The PDP-10 was eventually eclipsed by the VAX machines (descendants of the
PDP-11) when DEC recognised that the PDP-10 and VAX product lines were competing
with each other and decided to concentrate its software development effort on
the more profitable VAX. The machine was finally dropped from DEC's line in
1983, following the failure of the Jupiter Project at DEC to build a viable new
model. (Some attempts by other companies to market clones came to nothing; see
Foonly and Mars.) This event spelled the doom of ITS and the technical cultures
that had spawned the original Jargon File, but by mid-1991 it had become
something of a badge of honourable old-timerhood among hackers to have cut one's
teeth on a PDP-10.
See TOPS-10, AOS, BLT, DDT, DPB, EXCH, HAKMEM, JFCL, LDB, pop, push.
[Was the PDP-10 a mini or a mainframe?]
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Programmed Data Processor model 11.
A series of minicomputers based on an instruction set designed by C. Gordon Bell
at DEC in the early 1970s (late 60s?). The PDP-11 family, which came after, but
was not derived from, the PDP-10, was the most successful computer of its time
until it was itself succeeded by the VAX.
Models included the 11/23 and 11/24 (based on the F11 chipset); 11/44, 11/04,
11/34, 11/05, 11/10, 11/15, 11/20, 11/35, 11/40, 11/45, 11/70, 11/60 (MSI and
SSI); LSI-11/2 and LSI-11 (LSI-11 chipset). In addition there were the 11/8x
(J11 chipset) and SBC-11/21 (T11 chip) and then there was compatibility mode in
the early VAX processors.
The B and C languages were both used initially to implement Unix on the PDP-11.
The microprocessor design tradition owes a heavy debt to the PDP-11 instruction
See also SEX.
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