M7821 variants

Noel Chiappa jnc at mercury.lcs.mit.edu
Tue Sep 24 09:41:38 CDT 2019

So I just discovered that there are three wildly different variants of the
M7821 Interrupt Control card. More here, with images:


I'll have to dredge around and see if I can find circuit diagrams for them
all; they are wildly different, the -C has many fewer components than
the -B and -D, and the latter has a couple of delay lines.


PS: Sorry about that dis-directed message to Cindy; not quite sure what
I did wrong there.

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