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Year 18-bitters 12-bitters 16-bitters 36-bitters
1960 PDP-1 --------------------------------------------------------
1961 | \
1962 PDP-4 <--- LINC -------- \
1963 | PDP-5 \ \ |
1964 PDP-7 | \ \ PDP-6
1965 | PDP-8 --\ | \ |
1966 | PDP-8/S LINC-8 | |
1967 | | | | KA10
1968 PDP-9 PDP-8/I,L | | |
1969 | | PDP-12 | |
1970 PDP-15 | PDP-14 PDP-11(/20) |
1971 | PDP-8/E / | \ |
1972 PDP-15/76 PDP-8/M - PDP-11/05 | PDP-11/45 -- KI10
1973 | / | PDP-11/40 | \ |
1974 | / | | | \ |
1975 PDP-8/A PDP-11/03 PDP-11/04 | | PDP-11/70 KL10
1976 | PDP-11/34 | PDP-11/55 | |
1977 VT78 | PDP-11/60 | |
1978 PDP-11/34C VAX-11/780 KS10
The first DEC 36-bit system, the PDP-6, came out in 1964. The PDP-10
line consisted of the KA which arrived in 1967, the KI in 1972. The
KL came out early in 1974; the KS was a 1978 entry. In 1984 the
unreleased KC was canceled.
Source: C.G. Bell, et al's "Computer Engineering" 1978 (mostly)
More at
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