59 lines
1.1 KiB
Plaintext
59 lines
1.1 KiB
Plaintext
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.include "system/system.asm6502"
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.segment "CODE"
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;********************************************************************************
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; Interrupts
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;********************************************************************************
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nmi:
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rti
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irq:
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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rti
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;********************************************************************************
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; Reset sequence
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;********************************************************************************
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reset:
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sei
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; setup io2 bank a 1-3
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lda #%11111111
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sta IO1 + IO_DDRA
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@loop:
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lda #%00000000
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sta IO1 + IO_RANH
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.repeat 3
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nop
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.endrepeat
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lda #%11111111
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sta IO1 + IO_RANH
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.repeat 5
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nop
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.endrepeat
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bra @loop
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;********************************************************************************
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; reset vector
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;********************************************************************************
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.segment "RESET_VECTOR"
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.word nmi
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.word reset
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.word irq
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