PDP-11/05 microcode dump?

Mattis Lind mattislind at gmail.com
Sat May 7 13:04:10 CDT 2016

>     > The failing chip was yet another NS chip in plastic
> Can you see the type? I'd like to add to the page lists of all the
> alternate
> chip types DEC used in place of the Intersil chips specified in the
> drawings.
I'll check all PROM chips on both board sets tomorrow.

>     >> the 'F' etch rev has one less PROM chip than the 'E' etch rev, but I
>     >> suspect .. that it's not a micro-program chip, though
> My guess was correct; the missing chip is the one I called "Internal
> interrupt acknowledge"; it was replaced with a 74154 4->16 demux.

What about compatibility between different revisions? I.e. Is it possible
to mix DataParh board and Control board from different revisions with
different microcode?


>         Noel

More information about the cctalk mailing list