bit7 

 bit6 

bit5

bit4

bit3

bit2

bit1

bit0

 Saturn Peripheral ID 

 1 

 1 

1

0

0

0

1

1

 1st Data  

 Y Over 

 X Over 

Y Sign

X Sign

Start

Middle

Right

Left

 2nd Data  

 XD7 

 XD6 

XD5

XD4

XD3

XD2

XD1

XD0

 3rd Data  

 YD7 

 YD6 

YD5

YD4

YD3

YD2

YD1

YD0

 Y Over, X Over 0: X or Y data is valid.
* 1. Data overflows. (Over 255)
Y Sign, X Sign 0: X, Y data is a positive value.
: Data of 1: X, Y is a negative value.
XD7 to XD0, YD7 to YD0 Absolute value of mouse movement
1 when the Start, Middle, Right, Left button is pressed. 

Table 3.17 Sega Tap port status in SMPC control mode

Multi-tap ID	Number of connections
0H	4H

Table 3.18 Saturn standard PAD data format in SMPC control mode

	bit7	bit6	bit5	bit4	bit3	bit2	bit1	bit0
Saturn Peripheral ID	0	0	0	0	0	0	1	0
1st Data	Right	Left	Down	Up	Start	A TRG	C TRG	B TRG
2nd Data	R TRG	X TRG	Y TRG	Z TRG	L TRG	1	1	1

* Right, Left, Down, Up, Start, A TRG, C TRG, B TRG, R TRG, X TRG, Y TRG, Z TRG, L TRG are 0 when the button is pressed.