mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-11-22 14:33:51 +00:00
31 lines
899 B
Plaintext
31 lines
899 B
Plaintext
|
|
||
|
|
* = $7ffe
|
||
|
|
; 2-byte load address for ROM image
|
||
|
|
!word $8000
|
||
|
|
; http://swut.net/c64cart-howto.html
|
||
|
|
; https://codebase64.org/doku.php?id=base:assembling_your_own_cart_rom_image
|
||
|
|
!word CartKReset ; cold start vector
|
||
|
|
!word CartWStart ; warm start vector
|
||
|
|
!byte $c3, $c2, $cd, $38, $30 ; "CBM80"
|
||
|
|
CartKReset
|
||
|
|
STX $D016 ; Turn on VIC for PAL / NTSC check
|
||
|
|
JSR $FDA3 ; IOINIT - Init CIA chips
|
||
|
|
JSR $FD50 ; RANTAM - Clear/test system RAM
|
||
|
|
JSR $FD15 ; RESTOR - Init KERNAL RAM vectors
|
||
|
|
JSR $FF5B ; CINT - Init VIC and screen editor
|
||
|
|
CLI ; Re-enable IRQ interrupts
|
||
|
|
CartBReset
|
||
|
|
; init BASIC?
|
||
|
|
!ifdef CART_INIT_BASIC {
|
||
|
|
JSR $E453 ; Init BASIC RAM vectors
|
||
|
|
JSR $E3BF ; Main BASIC RAM Init routine
|
||
|
|
JSR $E422 ; Power-up message / NEW command
|
||
|
|
LDX #$FB
|
||
|
|
TXS ; Reduce stack pointer for BASIC
|
||
|
|
; don't init BASIC, just NOP
|
||
|
|
} else {
|
||
|
|
!fill 12, $ea ; nop
|
||
|
|
}
|
||
|
|
CartWStart
|
||
|
|
; should be * = $x025
|