>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_at_trailing-edge.com
Trailing Edge Technology WWW: http://www.trailing-edge.com/
7328 Bradley Blvd Voice: 301-767-5917
Bethesda, MD, USA 20817 Fax: 301-767-5927
Received on Sat Nov 27 1999 - 14:35:11 GMT