Re: More CPLD explorations

Perhaps a register to control a banked kernal or basic rom device (think
romEL bank control in software)?  I'm feature-creeping, so keep that in
mind. :)


On Mon, Feb 24, 2014 at 11:04 PM, Groepaz <groepaz@gmx.net> 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 :)
>
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