Need more help with cartridge
in [Commodore]
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From: Sam on 18 Jun 2010 17:13 Sice I got no more reactions on my previous post: Need some help with a cartridge. Summary: The cartridge is self starting and a routine on it copies data (a game) from the Eprom to Ram and executes it with jmp $0816 (SYS2070) who is the start address of the game.The game is starting with the openingscreen. You have to puss the firebutton of joy 2 to go on. When I do that, the C64 returns to the blue basic screen with "READY. I have to"enter "SYS2072" to go on. When I change the start address in the copy routine on the cartridge to $0810 off course the game doesn't start. But after that I only have to give "RUN" and it works fine. Any suggestions ?? Regards, SAM
From: Joe Forster/STA on 18 Jun 2010 17:33 > Sice I got no more reactions on my previous post: Need some help with > a cartridge. Try simulating the RUN command; see its code in the C64 KERNAL. By the way, bumping your post won't get you further. Actually, bumping is considered against the rules on many (moderated) forums.
From: Sam on 18 Jun 2010 17:43 On 18 jun, 23:33, "Joe Forster/STA" <s...(a)c64.org> wrote: > Try simulating the RUN command; see its code in the C64 KERNAL. Hello Joe, I was thinking about that, but where in the code do I implement that command ? > By the way, bumping your post won't get you further. Actually, bumping > is considered against the rules on many (moderated) forums. I know Joe, but my previous post ended in a quarrel between two Italian guys.. Best regards, SAM
From: Sam on 19 Jun 2010 13:46 On 18 jun, 23:33, "Joe Forster/STA" <s...(a)c64.org> wrote: > Try simulating the RUN command; see its code in the C64 KERNAL. JOE !!!! Got it working now. Thanks for your suggestion ! And also thanks to iAN for the disassembling of the code (See previous post) who was very very helpfull for me. I have studied it for a long time and after that I understand more and more what is going on. Instead of the jmp $0810 (4C 10 08) to the start address, I've placed jsr $A659 (20 59 A6) and after that jmp $A7AE (4C AE A7)... $A659 is the location of the kernal's RUN command and $A7AE executes it... I've tried the RUN command before but forgot that a execute is needed.. Best regards, SAM
From: Nick on 21 Jun 2010 09:23
> When I change the start address in the copy routine on the cartridge > to $0810 off course the game doesn't start. But after that I only have > to give "RUN" and it works fine. Its been a while since I tried this sort of thing, but I used to stuff the keyboard buffer then end from the ML (warm basic start). The RUN would be typed and the program execute. I never worked out how to do it from ML, though you supposed to be abled to... Cheers, Nick |