mirror of https://github.com/mgcaret/rom4x.git
16 lines
521 B
ArmAsm
16 lines
521 B
ArmAsm
; 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"
|
|
.code
|
|
.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.
|
|
|