dma0:
	rep #$10 : .xl
	sep #$20 : .as
	lda dma_mode
	sta $4300
	lda dma_b_reg
	sta $4301
	lda dma_a_bank
	ldx dma_a_addr
	stx $4302
	sta $4304
	ldx dma_len
	stx $4305
	lda #$01
	sta $420b
	rts

setup_hdma:
	sep #$20 : .as
	rep #$10 : .xl
	stz $420b
	stz $420c

	lda #$00		;A to B; direct; 1x single reg
	sta $4310		;ch. 1 for blanking
	lda #$00		;2100 = inidisp
	sta $4311
	lda #^hdma_blank
	ldy #!hdma_blank
	sty $4312
	sta $4314

	lda #$00		;A to B; direct; 1x single reg
	sta $4320		;ch. 2 for tilemap switch
	lda #$07		;2107 = BG1 Tilemap Address
	sta $4321
	lda #^hdma_tilemap
	ldy #!hdma_tilemap
	sty $4322
	sta $4324

	lda #$03		;A to B; direct; 2x 2x single reg
	sta $4330		;ch. 3 for scroll
	lda #$0d		;210d = BG1HOFS
	sta $4331
	lda #^hdma_scroll
	ldy #!hdma_scroll
	sty $4332
	sta $4334

	ldx #185		;Set IRQ trigger to line 185
	stx $4209		;
	lda #$0e
	sta $420c
	rts