DMA:	macro	mode,source,dest,len

	pha

	lda	#@mode
	sta	DMAP0
	lda	#@dest
	sta	BBAD0
	lda	#@source & $ff
	sta	A1T0L
	lda	#{@source >> 8} & $ff
	sta	A1T0H
	lda	#{@source >> 16} & $ff
	sta	A1B0
	lda	#@len & $ff
	sta	DAS0L
	lda	#{@len >> 8} & $ff
	sta	DAS0H
	lda	#1
	sta	MDMAEN

	pla

	endm