rl	A		;A now 0, or 2, or 4 ....
	push	ACC		;effectively, push A
	anl	A,#08H		;check for A >=8
	cjne	A,#08H,USE0_3	;A < 8, use IM0_3
	pop	ACC		;A >= 8, restore A
	add	A,#IM4_7+8	;pointer into IM4_7
	jmp	OVR0_3		;skip over 0-3 setup
USE0_3:	pop	ACC		;ch A < 8, restore A
	add	A,#IM0_3+8	;get the pointer into IM0_3
OVR0_3: mov	R0,A		;from here on, same for all A