Re: More CPLD explorations

From: Groepaz <groepaz_at_gmx.net>
Date: Tue, 25 Feb 2014 15:21:58 +0100
Message-Id: <201402251521.59296.groepaz@gmx.net>
On Tuesday 25 February 2014, you wrote:
> 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...

err yes. thats why i said "the VIC does never see chargen". that obviously 
means it is always gone, in all banks. that gives additional 8k of memory to 
use for gfx.

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