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 XD7 to XD0, YD7 to YD0 Absolute value of mouse movement
1 when the Start, Middle, Right, Left button is pressed. 

■ Saturn standard PAD (tentative name)

Saturn standard PAD is a TH and TR control type peripheral.
∙ Data is output by repeating the TH and TR bits with the specified bit pattern. After changing TH and TR, read R, L, D and U after 2μS.
Table 3.36 shows the Saturn standard PAD data format in SH-2 direct mode.

Table 3.36 Saturn Standard PAD Data Format in SH-2 Direct Mode

* 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.

■ Saturn Analog Joystick (tentative name)

Saturn Analog Joystick is a 3-wire handshake peripheral. It starts when TH is set to 0B, and ends when both TH and TR are set to 1B.
The first data is the Mega Drive ID acquisition phase. Data can be obtained by changing TH from 1B to 0B. Read R, L, D, U after 2μS after TH change.
Please obtain the following data by handshaking with TR and TL.
Table 3.37 shows the data format of the Saturn analog joystick in SH-2 direct mode.


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