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

27 Nov 1999

...
 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 :-) 
We're pretty sure you're talking about the 8234, and this is what's
said about it in the Nova 800 Technical Manual:

   Truth table:

  S0  S1  FN

   0   0  !B
   1   0  !A
   0   1  !B
   1   1   1

   Pinout:

1  A0
2  B0
3  F0
4  F1
5  B1
6  A1
7  S1
8  Gnd
9  S0
10 A2
11 B2
12 F2
13 F3
14 B3
15 A3
16 Vcc

Does this make any sense?

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