STN-45

Sega Saturn Keyboard Supplementary Explanation

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Contents

Sega Saturn Keyboard Data Format Ver1.00

	bit7	bit6	bit5	bit4	bit3	bit2	bit1	bit0
Peripheral ID	0	0	1	1	0	1	0	0
1st data	Right	Left	Down	Up	Start	ATRG	CTRG	BTRG
2nd data	RTRG	XTRG	YTRG	ZTRG	LTRG	KB TYPE2	KB TYPE1	KB TYPE0
3rd data	0	Caps	Num	Scr	Make	1	1	Break
4th data	D7	D6	D5	D4	D3	D2	D1	YD0

● Corresponding peripheral character code: Keyboard = "K"

● Saturn Peripheral ID = 34H

Saturn peripheral type ...	3H
Data size···········	4H (4 bytes)

KB TYPE2 ~ 0 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・	000B = Sega Saturn Keyboard 001B ~ 110B = Reservation 111B = Not recognized as a keyboard
CapsLock ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・	Caps Lock outputs "1" in the locked state
NumLock ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・	NumLock outputs "1" in the locked state
ScrLock ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・	ScrLock outputs "1" in the locked state
Make ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・	Output "1" when there is a valid Make code in D7 to D0
Break ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・	Output "1" when there is a valid Break code in D7 to D0
D7 ~ D0 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・	Key code. This data is undefined when Make and Break are other than "1" For key codes and keys, refer to "● Key code correspondence table" below.
Right, Left, Down, Up, Start ... ATRG, BTRG, CTRG, XTRG, YTRG, ZTRG, LTRG, RTRG	Output "0" while the button (key) is pressed

■ The relationship between the Sega Saturn standard pad button and the keyboard is as follows.

Right ...	[→] key	CTRG ....	[C] key
Left .....	[←] key	XTRG ....	[A] key
Down .....	[↓] key	YTRG ....	[S] key
Up ......	[↑] key	ZTRG ....	[D] key
Start ...	[ESC] key	LTRG ....	[Q] key
ATRG ....	[Z] key	RTRG ....	[E] key
BTRG ....	[X] key

• The flag changes for the CapsLock, NumLock, and ScrLock keys are as shown above.

The key code is sent out sequentially by rollover. Also, when the key is released, the code is sent in sequence.
However, when a wraparound caused by repeated keystrokes is detected, it continues to wait until the state is released.

1) When wraparound does not occur



2) When wraparound occurs



3) Repeat function (for all keys)



While the key is pressed, the Make code is continuously sent. Also, if you press another key, you will enter a new repeat cycle.

 0

 1

 2

 3

 4

 5

 6

 7

 8

 9

 A

 B

 C

 D

 E

 F

• 11H [Alt key] is on the left side of the keyboard.
• 17H [Alt key] is: Right side.
• 12H [Shift key] is on the left side of the keyboard.
• 59H [Shift key] is: Right side.
• 14H [Ctrl key] is on the left side of the keyboard.
• 18H [Ctrl key] is: Right side.