ca65 -g basic/basic.s ca65 -g kernal/kernal.s ld65 -C rom.cfg -o rom.bin basic/basic.o kernal/kernal.o -Ln rom.txt -m map.txt python checksum.py --new basic.bin 0xa0 0x1f52 python checksum.py --new kernal.bin 0xe0 0x4ac copy kernal.bin ..\