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41 lines
892 B
ArmAsm
41 lines
892 B
ArmAsm
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; IRQ handling (CreatiVision version)
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;
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.export initirq, doneirq
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.import callirq, irq2
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.include "creativision.inc"
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; ------------------------------------------------------------------------
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.segment "ONCE"
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initirq:
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lda #<IRQStub
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ldx #>IRQStub
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jmp setvec
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; ------------------------------------------------------------------------
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.code
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doneirq:
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lda #<BIOS_IRQ2_ADDR
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ldx #>BIOS_IRQ2_ADDR
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setvec: sei
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sta irq2+1
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stx irq2+2
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cli
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rts
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; ------------------------------------------------------------------------
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.segment "CODE"
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IRQStub:
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cld ; Just to be sure
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jsr callirq ; Call the functions
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jmp BIOS_IRQ2_ADDR ; Jump to the BIOS IRQ vector
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