Hitachi 902 - Function of each Short Plug

6 - 5
Function of Each Short Plug
Designation
of Short Pin
Function
IF Selection of how to change recording capacity mode
T1
IF T1 T2 Function
T2 O O O 2 modes (2.0/1.0 MB)
Automatic changeover with inserted disk
2.0 MB : When HD disk is used
1.0 MB : When DD disk is used
S S O 2 modes (2.0/1.0 MB)
Changeover with MODE SELECT signal
2.0 MB : When MODE SELECT signal is "HIGH"
1.0 MB : When MODE SELECT signal is "LOW"
S S S 2 modes (2.0/1.0 MB)
Changeover with MODE SELECT signal
2.0 MB : When MODE SELECT signal is "LOW"
1.0 MB : When MODE SELECT signal is "HIGH"
S O O 3 modes (2.0/1.6/1.0 MB)
Changeover with inserted disk plus MODE SELECT signal
2.0 MB : When HD disk is used and MODE SELECT
signal is "HIGH"
1.6 MB : When HD disk is used and MODE SELECT
signal is "LOW"
1.0 MB : When DD disk is used regardless of MODE
SELECT signal
S O S 3 modes (2.0/1.6/1.0 MB)
Changeover with inserted disk plus MODE SELECT signal
2.0 MB : When HD disk is used and MODE SELECT
signal is "LOW"
1.6 MB : When HD disk is used and MODE SELECT
signal is "HIGH"
1.0 MB : When DD disk is used regardless of MODE
SELECT signal
O O S 2 modes (1.6/1.0 MB)
Automatic changeover with inserted disk
1.6 MB : When HD disk is used
1.0 MB : When DD disk is used
Note: The recording capacity mode is changed over with the logic level ("H"/"L") of
MODE SELECT signal.
H2 Selection of HIGH DENSITY signal output pin
H4
H2 H4 Function
S O Output to J1-2 pin
O S Output to J1-4 pin
O O Not output (open)