Re: PLA replacement with 22V10

From: Ethan Dicks <*ethan.dicks_at_gmail.com*> Date: Tue, 26 Mar 2013 11:23:52 -0400 Message-ID: <CAALmimmF_xEk1s_rKcaeiJn1=SE+W0O1jpi+dja6WyHh3isJGA@mail.gmail.com> · ethan.dicks_at_gmail.com

On Tue, Mar 26, 2013 at 10:59 AM, Michał Pleban <lists@michau.name> wrote:
> Hello!
>
> I was wondering, has anyone ever considered creating a PLA replacement
> with two GAL22V10 devices? This should be a rather straightforward task,
> and two such chips should easily provide enough input and output pins to
> replace the PLA. I am actually surprised that so far efforts to replace
> the PLA chip focused on EPROM or CPLD based solutions, but what about
> PAL/GAL? This is actually what the PLA itself is, anyway? ;-)

EPROM solutions are easy to implement - the PLA is essentially a
"fast" (by 1982 standards) EPROM, not a PAL/GAL.

I haven't memorized the access time of the 82S100, but an EPROM
with an equivalent (or better) value will drop in there nicely.  ISTR it
takes a 27C512 or so, but someone who's done it can certainly
quote exact values.

-ethan

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