20C1 is a 24-pin programmable decoder with two sums of 8 product terms OR'd
into a single final Or/Nor gate. It's clearly intended for use as a
decoder, having 20 inputs and a single output sum of products with both true
and complement outputs on separate inputs.
It's right here in my '89 NS programmable logic databook.
If you want, I can (probably fairly soon) scan it for you and email you the
image (in TIFF).
----- Original Message -----
From: William Donzelli <aw288_at_osfn.org>
To: <classiccmp_at_classiccmp.org>
Sent: Saturday, July 01, 2000 8:47 PM
Subject: Odd PAL
> I finally unburied a whole shipload of PALs I bought many years ago, and
> started to sort them. I have a few National Semiconductor types called
> 20C1s. What is the organization of these? Apparently not a popular item,
> as I found little information on the web.
>
> William Donzelli
> aw288_at_osfn.org
>
>
Received on Sun Jul 02 2000 - 04:40:00 BST