--- Marko_Mäkelä <firstname.lastname@example.org> wrote: > On Mon, 14 Jan 2002, Ethan Dicks wrote: > > > I haven't, but now I will. The problem comes in that the Infocom engine > > takes over the machine and roaches the zero page (in fact, everything below > > the start of BASIC). Something called by $FFD2 is scribbling on a location > > that I have assigned and I don't know what it is. > > Try setting a write watchpoint in VICE. When I started developing this (original disassembly was on my C-64, the final development was on an older version of VICE on a SPARCstation, around 1998). I wanted watchpoints and I don't think I had them. If VICE can give me a watchpoint that will trigger if a zero-page location is written to from a PC address above, say, $8000, then that's _exactly_ what I need. I can feed in my zero-page variables as used by the program and when someone in ROM steps on something I'm trying to use - BINGO! If I can't tie the PC address at the time of the write to the watch-point, it'll be slower to debug, but I can still do it. > BTW, I just released cbmlink 0.9.1 and c2n 1.0.2, as both source code and > as 32-bit Windows executables, which have been tested on versions 98 and > 2000. The next version will probably support 6551 based serial > connections on the CBM-II series and plus/4, and perhaps also on the > C64/C128 equipped with a cartridge. Cool. I can't wait to buy/build one. Might even want two! -ethan > Have you considered implementing your own "print to screen" routine? Yes, but I also need to be able to "print to device" - ZIP runs its own paged-demand memory swapping scheme to pull in game data as it's needed into the memory from $2000 to top of RAM - there's three pools of memory used by ZIP - local storage, dirty storage (that gets saved when you write out a saved game) and pure storage - the game file itself. Sectors get swapped in and out as needed by the ZIP executive. I have to be able to perform IEEE operations, thus the need to see what's stepping on me. I just need to know where to get out of the way to, and I'm all set. When I'm done, I should be able to issue a patch to a genuine C-64 disk to modify it for use with the PET. > If you bypass the ROM routines, the same binary could run on all ROM > versions. True. > Of course, you'd need to detect the hardware, and you'd have to > swap the zero page to somewhere else while doing disk I/O. Ow... I think I'd rather find a way to co-exist. The game does constant disk I/O. -ethan ===== Visit "The Seventh Continent" http://penguincentral.com/penguincentral.html __________________________________________________ Do You Yahoo!? Send FREE video emails in Yahoo! Mail! http://promo.yahoo.com/videomail/ Message was sent through the cbm-hackers mailing list
Archive generated by hypermail 2.1.1.