Re: More CPLD explorations

From: Groepaz <>
Date: Tue, 25 Feb 2014 15:21:58 +0100
Message-Id: <>
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.


Dick size still matters, just that money, race and in some extreme cases 
personality has a greater impact than an inch or two.

       Message was sent through the cbm-hackers mailing list
Received on 2014-02-25 15:00:07

Archive generated by hypermail 2.2.0.