4cade/src/demo/moon.patrol.a

;license:MIT
;(c) 2021 by Frank M.

!cpu 6502
!to "res/DEMO/MOON.PATROL",plain
*=$200

         !source "src/constants.a"   ; no code in these
         !source "src/macros.a"

         +READ_RAM2_WRITE_RAM2
         jsr   EnableAccelerator
         +LOAD_FILE_AT title, $00

         lda   #$60
         sta   $49DD
         jsr   $800

         lda   #$4C
         sta   $2A95
         sta   $2A7E
         sta   $0C31
         sta   $2E80
         lda   #0
         sta   $2A95+1
         sta   $2A7E+1
         sta   $0C31+1
         sta   $2E80+1
         lda   #1
         sta   $2A95+2
         sta   $2A7E+2
         sta   $0C31+2
         sta   $2E80+2    ; exit on keypress/end of demo

         lda   #$A2
         sta   $0996
         lda   #$FF
         sta   $0996+1
         lda   #$9A
         sta   $0996+2    ; prevent stack pointer from overwriting $100

         ldx   #26-1
-        lda   patch, x
         sta   $2726, x
         dex
         bpl   -          ; exit on keypress during title screen

         lda   #$2C
         sta   $2A61
         sta   $2A88      ; disable options screen

         +DISABLE_ACCEL

         jmp   $919

title    !byte x_e-x_b
x_b      !text "X/MOON.PATROL/MOON.PATROL"
x_e

patch    !byte $20,$B8,$0A,$2C,$10,$C0,$A2,$41,$A9,$FF,$20,$A8,$FC,$AD,$00,$C0,$10,$05,$4C,$00,$01,$EA,$EA,$CA,$D0,$EE

!if * > $3F0 {
  !error "code is too large, ends at ", *
}