Re: PLA replacement

From: Mike Naberezny <>
Date: Tue, 27 Nov 2012 11:12:36 -0800
Message-ID: <>
On 11/27/12 10:22 AM, Gerrit Heitsch wrote:
> As for the timing... grab the datasheet for the 82S100 or the Fairchild
> 93459PC from the net. That's the original bipolar PLA. Its spec is 45ns,
> the fastest EPROM I have ever seen was a 27C256-55, but as I said, speed
> isn't everything.

I have seen 27C512-45 from AMD and STMicroelectronics.  This part is not 
common but you can usually find them on eBay from surplus dealers.  I used one 
to replace a bad PLA in my 8296D.

You can build an adapter easily using a socket and some wire:


Mike Naberezny (

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Received on 2012-11-27 20:02:10

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