Re: PLA replacement

From: Gerrit Heitsch <>
Date: Sat, 01 Dec 2012 19:05:30 +0100
Message-ID: <>
On 12/01/2012 05:51 PM, wrote:
> On 2012-11-27, at 19:35, Spiro Trikaliotis wrote:
>> Jens advertised his "SuperPLA"
>> ( AFAIK, this does
>> not use an EPROM, but a chip more suitable for this task.
> Probably for the reasons Gerrit described - EPROM can fail on occasions. I wonder what he used there. I thought it was an EPROM or another small footprint xPROM chip that could be placed on an adapter board with couple of jumpers to select the version for various target systems (one doesn't see it on the photo there) but of course it might be something else. I think I may just ask him ;-)

The SuperPLA uses a CPLD. AMD Mach210 or so. I have one of them in the 
form of a SuperPLA multi which can be used for different systems (C64, 
264, 1551, 8296) depending on jumper setting. Mine is not the current 
version since the 264 logic terms had a bug that keeps the keyboard from 
working. Therefore I use it for the C64 only.

It works fine in the later boards 250425 and 250466, but tends to cause 
problems on a 250407 and the 'KU' board, at least as far as I tested it 
with 'Egde of Disgrace' which crashed with the SuperPLA multi.

So even replacing the rather simple 82S100 and MOS's mask programmable 
derivate with something current isn't as easy as it looks...

I still have 2 82S100 that are supposed to be unprogrammed. Looking for 
someone who can program them for me.


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Received on 2012-12-01 19:00:05

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