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- First chunk checks system (if it's XL and memory is ok). - Second chunk contains the contents for the shadow memory beneath the ROM and copies the contents to their destination address. It also moves the screen memory to low memory in front of the program.
cc65 is a complete cross development package for 65(C)02 systems, including
a powerful macro assembler, a C compiler, linker, librarian and several
other tools.
cc65 has C and runtime library support for many of the old 6502 machines,
including
- the following Commodore machines:
VIC20
C16/C116 and Plus/4
C64
C128
CBM 510 (aka P500)
the 600/700 family
newer PET machines (not 2001).
- the Apple ][+ and successors.
- the Atari 8 bit machines.
- GEOS for the C64 and C128.
- the Nintendo Entertainment System (NES).
- the Supervision console.
- the Oric Atmos.
- the Lynx console.
The libraries are fairly portable, so creating a version for other 6502s
shouldn't be too much work.