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" <firstname.lastname@example.org> 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 Message was sent through the cbm-hackers mailing list
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