bit slice chips (was Re: Harris H800 Computer)

Noel Chiappa jnc at
Sat Apr 23 11:29:44 CDT 2016

    > From: Jon Elson

    > The 11/45 and 11/70 are mostly the same processor. ...
    > the data paths boards and FPU are the same part numbers

'Yes' to the FPP (well, there are two versions, the FP11-B and FP11-C, but
they are both identical in the two machines).

'No' to the data paths, though: e.g. the M8100 in the /45 (the board with the
74S181's on it) is replaced by the M8130 in the /70. The two are _very_
similar, but I suspect not interchangeable (examing the prints shows minor

AFAIK, the only non-FPP board in the CPU which is interchangeable between the
two machines is the M8132 (instruction register decode & condition codes) -
and only to the KB11-D /45 variant, not the -A.

{As always, just want to be accurate! :-}


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