[Simh] Simh Digest, Vol 198, Issue 16

[Johnny Billquist]

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: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol