2018-09-29 23:56:04 -07:00

16 lines
521 B

; This is the dispatch routine to call the primary ROM 4X
; functions of intercepting RESET and the boot process.
; If one enters at $CFF9, the command $A9 is loaded and
; we go to the BELL1 hijack. If entering at $CFFA, we
; load the command $EA and proceed the same way.
; thus we get two dispatch codes in 6 bytes.
.include "iic.defs"
.org $cff9 ; 7 bytes available here, but don't count on $CFFF
lda #$a9 ; lda opcode
nop ; jmp/jsr $cffa does lda #$ea
jmp $c7fc ; jump to 4X dispatcher
; total 6 bytes.