mirror of https://github.com/a2-4am/4cade.git
84 lines
1.6 KiB
Plaintext
84 lines
1.6 KiB
Plaintext
;license:MIT
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;(c) 2021 by Frank M.
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!cpu 6502
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!to "res/DEMO/PITFALL.II",plain
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*=$300
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!source "src/constants.a" ; no code in these
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!source "src/macros.a"
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+GAME_REQUIRES_JOYSTICK
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+READ_RAM2_WRITE_RAM2
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jsr EnableAccelerator
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+LOAD_FILE_AT title, $00
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lda #$60
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sta $3D34
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jsr $0800 ; decompress
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+RESET_VECTOR reset
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lda #$4C
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sta $2DF5
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sta $2E06
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lda #<callback1
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sta $2DF6
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lda #>callback1
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sta $2DF7
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lda #<callback2
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sta $2E07
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lda #>callback2
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sta $2E08
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lda #<callback3
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sta $6016
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lda #>callback3
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sta $6017
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+DISABLE_ACCEL
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jmp $6000 ;612A copies pages 2E & 2F to AE & AF for final location
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reset
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+READ_RAM2_NO_WRITE
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jmp ($FFFC)
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callback1
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sec
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sbc #8
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cmp #2
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bcc +
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- jmp $AE0A
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+ jmp $ADF9
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callback2
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sec
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sbc #8
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cmp #2
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bcs -
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jmp $AE21
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callback3
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ldx #6-1
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p1 lda patch, x
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sta $6055, x
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sta $AB43, x
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dex
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bpl p1 ; set demo exits
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lda #$BF
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sta $6021 ; reduce time before demo starts
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lda #$D0
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sta $6299 ; don't lose keypress on return
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jmp $ADE0
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patch !byte $AD,$88,$C0,$6C,$FC,$FF
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title !byte x_e-x_b
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x_b !text "X/PITFALL.II/PITFALL.II"
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x_e
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!if * > $3F0 {
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!error "code is too large, ends at ", *
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}
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