24 Sep
2019
24 Sep
'19
7:41 a.m.
So I just discovered that there are three wildly different variants of the
M7821 Interrupt Control card. More here, with images:
http://gunkies.org/wiki/M782_Interrupt_Control
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.
Noel
PS: Sorry about that dis-directed message to Cindy; not quite sure what
I did wrong there.