4cade/src/glue.launch.lc2.a

27 lines
836 B
Plaintext
Raw Normal View History

;license:MIT
;(c) 2018-9 by 4am & qkumba
;
2019-10-09 17:16:29 +00:00
; Functions to launch games and self-running demos
;
; /!\ These live in LC RAM 2 and rely on the ProRWTS code which is also in LC RAM 2. /!\
; Code in LC RAM 1 (which is most program code) should call the functions in glue.launch
; which handle bank switching for you.
2019-10-09 17:04:39 +00:00
LaunchInternal
ldy #$F1
- lda $100,y
2019-11-27 21:51:43 +00:00
sta STACKBASE - $EF,y ; back up stack
2019-10-09 17:04:39 +00:00
iny
bne -
tsx ; back up stack pointer
2019-11-27 21:51:43 +00:00
stx STACKPTR + 1
2019-10-09 17:04:39 +00:00
sty RestoreStackNextTime + 1
; tell |Reenter| to restore the stack and stack pointer
tya
ldy #$18
- sta $bf57,y
dey
bne -
jmp $106 ; jump to pre-launch code