STN-45

Sega Saturn keyboard supplementary information

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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

●Character code of compatible peripheral: 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・・・・・・・・・・・・	CapsLock outputs "1" when locked
NumLock・・・・・・・・・・・・	NumLock outputs “1” when locked
ScrLock・・・・・・・・・・・・	ScrLock outputs "1" when locked
Make・・・・・・・・・・・・	Outputs "1" when there is a valid make code in D7 to D0
Break・・・・・・・・・・・・	Outputs "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, see "Key code correspondence table" below.
Right, Left, Down, Up, Start・・・・・・・・・ ATRG,BTRG,CTRG,XTRG,YTRG,ZTRG,LTRG,RTRG	Outputs "0" while the button (key) is pressed

■The relationship between the Sega Saturn standard pad buttons 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 CapsLock, NumLock, and ScrLock keys are as shown above.

Send key codes sequentially with rollover. Also, when the key is released, the codes are sent out sequentially.
However, when a rotation caused by repeated keystrokes is detected, the system continues to wait until the state is released.

1) When no wrap-around occurs

2) In case of turning around

3) Repeat function (for all keys)

Make code continues to be sent while the key is pressed. Also, pressing any other key 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]: On the right side.
• 12H [Shift key] is on the left side of the keyboard.
• 59H [Shift key]: On the right side.
• 14H [Ctrl key] is on the left side of the keyboard.
• 18H [Ctrl key]: On the right side.