35 lines
695 B
Plaintext
35 lines
695 B
Plaintext
; This file is part of the snescom-asm demo - a demo of how to build a SNES program.
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; See http://bisqwit.iki.fi/source/snescom.html for details.
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#include "dma.i65"
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#define TILE_ADDR_REG_VAL(addr, scsize) \
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(((addr & $FC00) >> 8) + scsize)
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#define BMAP_ADDR_REG_VAL(addr, addr2) \
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(((addr & $F000) >> 12) | (((addr2 & $F000) >> 12) << 4))
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; NMI - called on VBlank
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NMI_ROUTINE:
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php
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sep #$20 : .as
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pha
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lda $4210 ; ack interrupt
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; lda #$0e
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; sta $420c ; enable HDMA ch. 1-3
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pla
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plp
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rtl
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; IRQ - called when triggered
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IRQ_ROUTINE:
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php
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sep #$20 : .as
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pha
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lda $4211 ;Acknowledge irq
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lda #$01
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sta isr_flag
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pla
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plp
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rtl
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