Sega INITIAL "D" TYPE TWIN. - Manual (Page 55)

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B. INPUT TEST
Press the SERVICE and TEST Buttons simultaneously to return to the Game Test Menu screen.
FIG. 10. 3 b INPUT TEST Screen
Select INPUT TEST to display the following screen and check the status of input devices.
This test should be used periodically to check that each input device is functioning correctly.
Test the STEERING, ACCEL and BRAKE controls to ensure that they are functioning properly
and that the parameters change smoothly as each input device is operated.
Display N, UP and DOWN using the GEAR POSITION. N should display there is no control
input. Verify that both UP and DOWN display in sync with the position of the shift knob.
Press the START, CHANGE VIEW, SERVICE and TEST Buttons. If functioning correctly, each
indicator will switch from OFF to ON.
GAME TEST MODE
INPUT TEST
STEERING XXH
ACCEL XXH
BRAKE XXH
GEAR POSITION N
START OFF
CHANGE VIEW OFF
SERVICE OFF
TEST OFF
PRESS TEST AND SERVICE BUTTON
TO EXIT