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pebmeister
 Post subject: C64 ROM Address
PostPosted: Tue Aug 29, 2023 2:46 am 
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Joined: Tue Feb 19, 2013 12:29 am
Posts: 32
Location: Marlborough, Ma
For those interested I have some files I like to share that would be useful for anyone using Assembly language for the C64
    basic.asm - c64 basic locations
    kernal.asm - c64 kernal location
    macros.asm - general 6502 macros
    pagezeo.asm - c64 page 0 locations


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JimBoyd
 Post subject: Re: C64 ROM Address
PostPosted: Tue Aug 29, 2023 7:29 pm 
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Joined: Fri May 05, 2017 9:27 pm
Posts: 858
pebmeister wrote:
For those interested I have some files I like to share that would be useful for anyone using Assembly language for the C64
    basic.asm - c64 basic locations
    kernal.asm - c64 kernal location
    macros.asm - general 6502 macros
    pagezeo.asm - c64 page 0 locations

There are not many free zero page locations on the C64; however, if an assembly language program does not need to be used from BASIC, the BASIC ROM can be switched out. Zero page locations $2 through $8F will be available as well as the RAM underneath the BASIC ROM.
The assembly language program would need to restore BASIC when it finishes. One way to do this is to jump indirectly through address $FFFC, performing a system restart.
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