a2audit/audit/resetall.asm
2017-01-26 20:46:38 -06:00

39 lines
636 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 $300 and $301 in main mem.
RESETALL
sta RESET_RAMRD
sta RESET_RAMWRT
stx $300
sta $301
;; Save return address in X and A, in case we switch zero-page memory.
pla
tax
pla
sta RESET_80STORE
sta RESET_INTCXROM
sta RESET_ALTZP
sta RESET_SLOTC3ROM
sta RESET_INTC8ROM
sta RESET_80COL
sta RESET_ALTCHRSET
sta SET_TEXT
sta RESET_MIXED
sta RESET_PAGE2
sta RESET_HIRES
;; Restore return address from X and A.
pha
txa
pha
ldx $300
lda $301
rts
}