4cade/src/demo/stargate.a

;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 ", *
}