On 2020-07-10 04:37, Don North wrote:
On 7/9/2020 6:25 PM, Bob Supnik wrote:
Yes, the PDP11 Architecture Handbook was a post-facto effort. The J11
was finished; DEC did not intend to do another PDP11 processor. (I
wrote a spec for one, primarily as an exercise in trying to do a
different microcode structure than the PLA/ROM of the LSI11/F11/J11,
but I lost it.) The only formal part of the PDP11 architecture was the
Commercial Instruction Set extension, DEC STD 168, which was only
implemented by the F11 and the 11/44.
AND the PDP-11/74 CIS option, I might add. Fully implemented, never sold.
Not to mention that the 11/74 in itself was fully implemented, but never
sold... Not even the 11/70MP...
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: b...@softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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