Re: More CPLD explorations

From: Jim Brain <>
Date: Mon, 24 Feb 2014 22:13:57 -0600
Message-ID: <>
On 2/24/2014 10:04 PM, Groepaz wrote:
> On Tuesday 25 February 2014, you wrote:
>> This time, it's PLA replacements.
>> After fitting, the C64 PLA equations take only a nominal portion of the
>> xc9536(xl) space I stuffed them into.  And, none of the 36 registers are
>> used.
>> I know SuperPLA put a bunch of equations in the unit, for different
>> products, but I was wondering...
>> Are there any memory mappings that would have been nice to have via the
>> PLA, but are not available?  (external KERNAL at $e000, for instance?)
>> Yes, I understand compatibility and all that.  But, if you had a
>> switchable PLA, what new modes would be of interest? (are there any?)
> maybe one where the VIC does never see chargen (but always RAM instead)? that
> would be very nice for graphic effects :)
So, Bank 1/3 doesn't work?  I thought in those banks, charrom is gone...


Jim Brain

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Received on 2014-02-25 05:00:38

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