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 set.
See also
SEX.
(1994-12-21)