From: Ethan Dicks (ethan.dicks_at_gmail.com)
Date: 2008-06-15 12:44:55
On Sun, Jun 15, 2008 at 10:05 AM, "André Fachat" <afachat@gmx.de> wrote:
>
> Hallo Ethan,
>
>> What I was after the zero-page maps, though, was not for
>
> Would that help?
> http://www.zimmers.net/cbmpics/cbm/PETx/petmem.txt
I've already gotten past the problem that the maps I had weren't helping with,
but that document does have more info about the locations below $11 that
were causing me grief (locations with the same name were safely reused
in the C-64 code, but are apparently used in less-well-documented ways by
BASIC 4.0. Since C-64 and VIC-20 BASIC is nearly the same as PET
BASIC 2.0, it kind of explains the results I was seeing).
> If you have better ideas for links on this page:
> http://www.6502.org/users/andre/petindex/roms.html
> tell me please
I have that page up and will see what comes to mind.
>> What would be great would be a companion map that
>> would more-or-less show locations that were safe to re-use
>> if you weren't using BASIC - that was fundmentally my
>
> Maybe you can send your locations or even write up an article
> on your great work and publish it?
I've been thinking about that - pretty much a 16x16 color-coded
grid - one color for "can always use", another color for "can use
if BASIC is not needed", and certainly a color for "unproven".
I don't think I've ever seen such a chart, so I might as well make
the first version of it and get it into circulation for better refinement.
Naturally, there should be one chart per ROM/machine type for
best effect. I'm qualified to work on ones for PET2001/BASIC 1.0,
PET2001/CBM30xx BASIC 2.0, CBM40xx/BASIC 4.0, CBM/80xx/BASIC 4.0,
VIC-20, and C-64/SX-64. I'm not nearly as well versed on the C128, the CBM
B-Series, C16, etc., but if I can make a start on the machines I know,
someone else can take up the mantle for the other varieties.
>> It's been really exciting to make some progress on these
>> bugs after so long. I started working on this project over
>
> Yes, it's really great work you're doing there!
If anyone wants to play with what I have, drop me a line. I can shoot off
a small (few K-bytes) file that you would load, then run with a "real"
game disk mounted in drive 8. I've tested things with half-a-dozen
disk images I have lying around, but at the moment, the only
real 8-bit hardware I have close by is bare motherboards (one of
my other projects is to get a stripped Static PET working, along
with a 4032 board). I don't have any disks, but I do have a
C2N232 with me (and a couple of DIP AVRs so I could make a
dedicated C2N232 if I wanted to).
The version for the 8032 seems to be ready to unveil, and the
40-column version works and is playable except for some screen
garbage when the game scrolls the text.
-ethan
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