uban at ubanproductions.com
Mon Feb 6 10:14:49 CST 2006
In a pinch, you might be able to fit a logical equivalent circuit
using either some surface mount parts or a PAL/GAL...
At 07:58 AM 2/6/2006 -0800, you wrote:
>I've run across an old calculator that uses a couple of Signetics 8266 data
>selectors (selects one of two groups of 4-bit inputs). The problem is that
>this part is different than the 74157 -- it inverts one set of the inputs,
>and its select inputs are different. There's not enough room in the circuit
>board to kludge in a logical replacement, and I've searched high and low to
>try to find a couple of these. I'm positive that one of them is bad, as I
>can watch the inputs with a scope, and compare with the outputs, and there's
>one data line that is stuck high.
>Anyone out there happen to have one or two of these laying around that
>they'd be willing to part with for a reasonable price, or, perhaps know of a
>supplier where I might be able to buy a few of them?
>The Old Calculator Wen Museum
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