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This commit is contained in:
Peter Evans 2018-02-18 11:16:09 -06:00
parent 7c2c6d5d54
commit 0fccf552f2
1 changed files with 10 additions and 1 deletions
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data/disk2.asm
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@ -7,8 +7,17 @@
; NOTE THAT THIS SOURCE CODE IS NOT ORIGINAL TO APPLE. I translated by
; hand from the machine code in the ROM. Any comments, etc. you see
; here, are from me--NOT APPLE.
;
; For details on the assembly instructions--what they mean and do--this
; is a good resource:
; http://www.e-tradition.net/bytes/6502/6502_instruction_set.html
;
; Any number that has a $ in front of it means it's a hex number, vs.
; decimal.
; Our definitions for this little program
; Our definitions for this little program. The EQU symbol is not a
; formal instruction understood by the 6502 CPU; it's a notation that
; simply means "equals"; e.g. GBASL equals $26.
GBASL EQU $26
GBASH EQU $27
BAS2H EQU $2B