4cade/src/demo/stargate.a

71 lines
1.5 KiB
Plaintext

;license:MIT
;(c) 2021 by Frank M.
!cpu 6502
!to "res/DEMO/STARGATE",plain
*=$200
!source "src/constants.a" ; no code in these
!source "src/macros.a"
+GAME_REQUIRES_JOYSTICK
+READ_RAM2_WRITE_RAM2
jsr EnableAccelerator
+LOAD_FILE_AT title, $00
lda #$60
sta $4697
jsr $800 ; decompress
lda #$60
sta $9A03
jsr $9A00 ; decompress2
lda #$10
sta $0933
lda #$1E
sta $0933+1
lda #$4C
sta $0933+2
sta $0905
sta $51C7
sta $51D2
lda #0
sta $0933+3
sta $0905+1
sta $51C7+1
sta $51D2+1
sta $47F2 ; fix reset (moved to $3F2/$3F3/$3F4)
sta $47FE ; fix IRQ (moved to $3FE/$3FF)
lda #1
sta $0933+4
sta $0905+2
sta $51C7+2
sta $51D2+2 ; set exits
sta $47F2+1
sta $47FE+1
lda #$A4
sta $47F2+2 ; fix reset checksum
lda #$D0
sta $153B
sta $5F0E
sta $50B8
sta $1DF7
sta $1151
sta $16E0
sta $166B
sta $167A ; disable sound
+DISABLE_ACCEL
jmp $5000
title !byte x_e-x_b
x_b !text "X/STARGATE/STARGATE"
x_e
!if * > $3F0 {
!error "code is too large, ends at ", *
}