DG house numbered part xref/help with what *looks* like a mux... - test-drb@ccmp.vtda.org

27 Nov 1999

...
 I was wondering if anyone has a DG house number to
generic
part cross reference somewhere (if not I suppose I'll start one). 
Actually, yes, there is such a reference.  It's a few hundred pages, and
has pinouts for many "custom" DG chips.  My copy is out on permanent
loan, but if you get me the house number on the chip I'll have the
current holder look it up for you.

...
 Pat of this is prompted by a part (not *yet* suspect) I
ran
across on a Nova 800 CPU1 board.  From the prints it looks
like it's a a quad 2-input mux like a 74158, but the
pinouts are completely different and it's got wired-or
outputs suggesting OC outputs.  Select and enable are on
9 and 7 (I may have those switched); 1 = i0a, 2 = i0b,
3 = ya, 4 = yb, 5 = i1b, 6= i1a, 10 = i2a, 11 = i2b,
12 = yc, 13 = yd, 15 = i3a, 14 = i3b

Of course, that's just the way it's drawn.  It could be somewhat
different :-)

Does this part sound familiar to anyone? 
Um, what *is* the DG house number on this chip?

If you had a time machine you could go back 20 years and buy a bunch
of rejected versions of this chip, complete with DG house number, from
Poly-Paks, I bet :-).

-- 
 Tim Shoppa                        Email: shoppa(a)trailing-edge.com
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