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https://github.com/KarolS/millfork.git
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66 lines
802 B
Plaintext
66 lines
802 B
Plaintext
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asm void on_reset() {
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SEI
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CLD
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LDX #$40
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STX $4017
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LDX #$ff
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TXS
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INX
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STX ppu_ctrl
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STX ppu_mask
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STX $4010
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BIT ppu_status
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vwait1:
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BIT ppu_status
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BPL vwait1
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vwait2:
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BIT ppu_status
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BPL vwait2
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LDA #$00
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LDX #$00
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clean_byte:
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STA $000,x
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STA $100,x
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STA $200,x
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STA $300,x
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STA $400,x
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STA $500,x
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STA $600,x
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STA $700,x
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INX
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BNE clean_byte
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LDA #$00
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STA $2000
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STA $2001
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JMP main
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JMP on_reset
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}
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interrupt void on_irq() {
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irq()
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}
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interrupt void on_nmi() {
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nmi()
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}
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array nmi_vector @$FFFA = [
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on_nmi.addr.lo,
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on_nmi.addr.hi
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]
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array reset_vector @$FFFC = [
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on_reset.addr.lo,
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on_reset.addr.hi
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]
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array irq_vector @$FFFE = [
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on_irq.addr.lo,
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on_irq.addr.hi
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]
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