STN-44

Shuttle mouse supplementary explanation

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Contents

Shuttle Mouse Data Format Ver1.00

	bit7	bit6	bit5	bit4	bit3	bit2	bit1	bit0
Peripheral ID	1	1	1	0	0	0	1	1
1st data	YOver	XOver	YSign	XSign	Start	Middle	Right	Left
2nd data	XD7	XD6	XD5	XD4	XD3	XD2	XD1	XD0
3rd data	YD7	YD6	YD5	YD4	YD3	YD2	YD1	YD0

● Corresponding peripheral character code: Mouse = "M" (see) Character code list

● Saturn Peripheral ID = E3H

Saturn peripheral type ...	EH (Analog Device)
Data size···········	3H (3 bytes)

XOver, YOver ...	0: X and Y values (D7 to D0) are valid 1: Data overflow (greater than 0-255)
XSign, YSign ...	0: The values of X and Y (D7 to D0) are positive 1: X, Y values (D7 to D0) are negative
XD7 ~ XD, YD7 ~ YD0 ・ ・ ・ ・ ・ ・ ・ ・	Movement amount data (relative value)
Middle, Right, Left, Start ...	It becomes "1" when the button is pressed

Actual movement amount	-257 Less than	-256	-255	...	-2	-1	+0	+1	+2	...	+254	+255	+256 that's all
Values from D7 to D0	xxH	00H	01H	...	FEH	FFH	00H	01H	02H	...	FEH	FFH	xxH
Y / X Sign	1	1	1	...	1	1	0	0	0	...	0	0	0
Y / X Over	1	0	0	...	0	0	0	0	0	...	0	0	1

★ Caution 1: D7 to D0 are not signed. Calculate the movement amount while paying attention to the change of each bit of Y / XOver and Y / XSign.

★ Caution 2: When the Y / X Over bit is set, the movement amount (D7 to D0) becomes indefinite, so be sure to check this bit.

• The code in the figure indicates ON / OFF of the Sign flag.
• The arrow (↑ → ↓ ←) indicates the direction of mouse movement.