Re: MAX Machine PLA

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Sat, 30 Jul 2016 13:56:36 +0200 Message-ID: <79998fab-802d-874f-a764-ea5af1a372fb@laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 07/30/2016 01:27 PM, smf wrote:
> On 30/07/2016 03:51, Pete Rittwage wrote:
>> I didn't think it had any
>> alternative memory configurations, so it is likely a very simplified
>> version of the C64 version handling only the RAM timings, etc.
>
> Alternate memory configurations is only a small part of what the PLA in
> the c64 does.
>
> In the max the PLA also does the color ram to cpu bus switching.

That's something that can be handled with a CD4066, as in the C64. To me 
it sounds as if the PLA in the Max machine is rather simple and it 
should be possible to replace it with a much smaller logic chip than 
needed for the PLA in the C64.

  Gerrit

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