mirror of
https://github.com/blondie7575/GSCats.git
synced 2024-11-25 10:30:49 +00:00
54 lines
942 B
ArmAsm
54 lines
942 B
ArmAsm
;
|
|
; loader
|
|
; A very simplistic code loader designed to manage
|
|
; GS code under ProDOS 8 (if it's good enough for Will Harvey...)
|
|
;
|
|
; Created by Quinn Dunki on 7/29/17
|
|
;
|
|
|
|
.org $800
|
|
|
|
main:
|
|
NATIVE
|
|
|
|
; Copy main code that ProDOS 8 loaded into bank 2.
|
|
; Bank 2 is our "main" code bank because the GS fast
|
|
; graphics path really messes with banks 0 and 1.
|
|
; ProDOS 8 doesn't know anything about non-zero banks
|
|
; though, so things get loaded here and moved.
|
|
|
|
mainCopyStart:
|
|
ldx #0
|
|
lda #mainBank2
|
|
sta mainCopyDest+1
|
|
|
|
mainCopyLoop:
|
|
lda mainBank2,x
|
|
|
|
mainCopyDest:
|
|
sta $020800,x
|
|
inx
|
|
cpx #endMainBank2-mainBank2
|
|
bne mainCopyLoop
|
|
|
|
; Set up a long jump into bank 2, and
|
|
; a way for game code to get back here to exit
|
|
; properly to ProDOS 8
|
|
lda #returnToProDOS
|
|
sta proDOSLongJump
|
|
lda #mainBank2
|
|
sta mainLongJump
|
|
|
|
jml (mainLongJump)
|
|
|
|
returnToProDOS:
|
|
SYNCDBR
|
|
EMULATION
|
|
rts
|
|
|
|
mainLongJump:
|
|
.byte 00,08,02
|
|
proDOSLongJump:
|
|
.byte 00,00,00
|
|
|