mirror of
https://github.com/zellyn/a2audit.git
synced 2024-11-15 12:08:42 +00:00
29 lines
536 B
NASM
29 lines
536 B
NASM
|
;;; Apple II/IIe reset-everything routine
|
||
|
|
;;; Copyright © 2017 Zellyn Hunter <zellyn@gmail.com>
|
||
|
|
|
||
|
|
!zone resetall {
|
||
|
|
|
||
|
|
;;; Reset all soft-switches to known-good state. Burns X and Y, but preserves A.
|
||
|
|
RESETALL
|
||
|
|
tax ; Save A in X until we return
|
||
|
|
;; Save return address in Y and A, in case we switch zero-page memory.
|
||
|
|
pla
|
||
|
|
tay
|
||
|
|
pla
|
||
|
|
|
||
|
|
sta _80STORE_OFFW
|
||
|
|
sta RAMRD_OFFW
|
||
|
|
sta RAMWRT_OFFW
|
||
|
|
sta INTCXROM_OFFW
|
||
|
|
sta ALTZP_OFFW
|
||
|
|
sta SLOTC3ROM_OFFW
|
||
|
|
sta SLOTRESET
|
||
|
|
|
||
|
|
;; Restore return address from Y and A.
|
||
|
|
pha
|
||
|
|
tya
|
||
|
|
pha
|
||
|
|
txa ; Restore A
|
||
|
|
rts
|
||
|
|
}
|