APU register table/SMP

See: APU register table

This table lists the 2 common names for the S-SMP registers.

Name		Address	Bits	Type	Notes
TEST	Test	$F0	IIEE TRWH	W8	Undocumented test register.
CONTROL	Control	$F1	I.CC .210	W8	Enable IPL ROM (I), Clear data ports (C), timer enable (2,1,0).
DSPADDR	Register Address	$F2	RAAA AAAA	RW8	Selects a DSP register address.
DSPDATA	Register Data	$F3	VVVV VVVV	RW8	Reads or writes data to the selected DSP address.
CPUIO0	Port 0	$F4	VVVV VVVV	RW8	Reads or writes data to APUIO0.
CPUIO1	Port 1	$F5	VVVV VVVV	RW8	Reads or writes data to APUIO1.
CPUIO2	Port 2	$F6	VVVV VVVV	RW8	Reads or writes data to APUIO2.
CPUIO3	Port 3	$F7	VVVV VVVV	RW8	Reads or writes data to APUIO3.
	---	$F8	.... ....	RW8	Unused (normal RAM).
	---	$F9	.... ....	RW8	Unused (normal RAM).
T0TARGET	Timer 0	$FA	TTTT TTTT	W8	8KHz timer 0 interval.
T1TARGET	Timer 1	$FB	TTTT TTTT	W8	8KHz timer 1 interval.
T2TARGET	Timer 2	$FC	TTTT TTTT	W8	64KHz timer 2 interval.
T0OUT	Counter 0	$FD	0000 CCCC	R8	Timer 0 count-up.
T1OUT	Counter 1	$FE	0000 CCCC	R8	Timer 1 count-up.
T2OUT	Counter 2	$FF	0000 CCCC	R8	Timer 2 count-up.