sorry this took forever. try this one.

-paul

mdzron wrote:
>
> Thanks again, Paul, for the link to your basic rom package. Of course,
> that version is
> running but I'd really like to have the advanced 1.1 features inside ;)
>
> After fiddling with your 1031 basic I still had no luck in applying a
> basic ROM replacement
> patch on the current version. Maybe you remember what has to be done?
> What I could see
> after looking at the binary structure is like this:
>
> ----------------------------------------------------------
> cnth1031.basic header disassembled:
>
> $0000 94 E3 ; pointing to kernal reset routine E394
>
> $0002 7B E3 ; pointing to kernal warmstart entry E37B
>
> $0004 0D A0 ; guess this points to where the hacked basic.rom is
> appearing (starting at
> $A000) - pointer to kernal subroutines (see $000D)
> $0006 0D A0 ; same
>
> $0008 C3 C2 CD 38 30 ; Autostart command "CBM80" - but I think this is
> redundant,
> there's nothing at $8000?!?
>
> $000D 78 ; SEI - set interrupt mask
>
> $000E 20 84 FF ; jump to kernal subroutine FF84 = init I/O devices
>
> $0011 20 87 FF ; jump to kernal subroutine FF87 = init memory pointers
>
> $0014 20 8A FF ; jump to kernal subroutine FF8A = restore I/O vectors
>
> $0017 20 81 FF ; jump to kernal subroutine FF81 = initialise screen /
> keyboard
>
> $001A 58 ; clear interrut mask
>
> $001B-0028 EA ; NOP - no operation (guess not to crash kernal routines
> looking for
> BASIC things around there?)
>
> $0029-0482 FF ; not used
>
> $0483 ; program starts here (ROM appearing at $A483 = standard BASIC
> warmstart
> routine - guess this is where the Kernal is starting the program after
> init sequences.
>
> $0CFA ; end of program code (followed by FF to fill the 8K ROM)
>
> ----------------------------------------------------------
>
> However what comes now, how to put in program code after $0483?
>
> I think the basic starter (SYS 2061) has to be removed. How about
> absolute and relative
> addresses? Did you tweak them manually to get Cynthcart1031 running
> off the BASIC
> ROM? Could you maybe provide the unpatched Cynth1031.PRG so I may
> compare the code
> to solve the mystery?
>
> Besides running Cynthcart without a cartridge attached it would be
> nice to improve
> breadbox knowledge anyways ;)
>
> Thanks for your attention.
>
> ron.
>
>



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