Re: Test suite for 6509 processor

Den Tue, 27 Feb 2018 13:45:56 +0100 skrev Michał Pleban
<lists@michau.name>:
> Hello!
> 
> Mia Magnusson wrote:
> 
> > Maybe it would be a good idea for a 6509 replacement to have some
> > mechanism to always force the code bank to $f.
> 
> Then programs compiled with cc65 would not work as they run in bank 1.

Of course it would normally be turned off. The only reason to turn it
on is to be able to read/write $0/$1 which is only usable for 6509
software that work together with the 8088 card, or maybe use all memory
available to VIC-II in a P500. I assume that the 6509 code for the 8088
card would normally go in the small free ram in bank 15.

> > You could use the P500 emulation in VICE and use VIC-II to display
> > the contents of $0/$1.
> 
> I am not sure how good the P500 emulation in VICE is. It may be
> interesting to test ;-)
> 
> > If this differs from real 6509 hardware, it might be one of the
> > oddest bug reports sent to the VICE people ;)
> 
> I have some already pending regarding emulation of the CRTC in CBM-II,
> you reminded me to submit them.

:)

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