#define DMA0(mode, len, a_bank, a_addr, b_reg)\
	lda mode \
: 	sta dma_mode \
:	ldx a_addr \
:	lda a_bank \
:	stx dma_a_addr \
:	sta dma_a_bank \
:	ldx len \
:	stx dma_len \
:	lda b_reg \
:	sta dma_b_reg \
:	jsr dma0