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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.
The correspondence between each button and keyboard key is as follows.

 button 
 key 
Right
Left
Down
Up
Start
ESC
A TRG
Z
C TRG
C
B TRG
X
R TRG
E
X TRG
A
Y TRG
S
Z TRG
D
L TRG
Q

 KBTYPE2 ~ 0 000: Saturn keyboard
001-110: SEGA RESERVED
111: UNKNOWN 

The KBTYPE shown here is used for the IBM keyboard conversion adapter format. 000 is displayed when an IBM keyboard 101,102,106 keyboard is connected to the conversion adapter. If a keyboard that does not correspond to the conversion adapter or a device that cannot be recognized as a keyboard is connected, 111 is output. If the keyboard will be integrated in the future, it will be configured to output 000.
Caps Lock is 1: Caps Lock is locked (Caps Lock LED is lit)
Num Lock is 1: Num Lock is locked (Num Lock LED is lit)
Scroll Lock 1: Scroll Lock is locked (Scroll Lock LED is lit)
∙ Make indicates 1 when there is a valid make code in D7 to D0 (key press indicated by D7 to D0 code).
”Break indicates 1 when there is a valid Break code in D7 to D0 (key press release indicated by D7 to D0 code).
D7 to D0 indicate key numbers. Use with Make and Break.



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