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49 lines
861 B
ArmAsm
49 lines
861 B
ArmAsm
;
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; IRQ handling (PCE version)
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;
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.export initirq, doneirq, IRQStub, __nmi
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.import __INTERRUPTOR_COUNT__, callirq_y
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.include "pce.inc"
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.include "extzp.inc"
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; ------------------------------------------------------------------------
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.segment "ONCE"
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; a constructor
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;
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initirq:
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rts
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; ------------------------------------------------------------------------
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.code
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; a destructor
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;
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doneirq:
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rts
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; ------------------------------------------------------------------------
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IRQStub:
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phy
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; Save the display-source flags (and, release the interrupt).
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;
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ldy VDC_CTRL
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sty vdc_flags
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ldy #<(__INTERRUPTOR_COUNT__ * 2)
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beq @L1
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phx
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pha
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jsr callirq_y
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pla
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plx
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@L1: ply
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__nmi: rti
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