Read Sony XR-2800 / XR-2803 Service Manual online
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Pin No.
Pin Name
I/O
Function
73
SYSRST
O
Reset signal output terminal “L”: reset Not used (open)
74
VREG
O
CPU regulator output terminal Connected to capacitor
75
GND
—
Ground terminal
76
X OUT
O
Main system clock output terminal (4.5 MHz)
77
X IN
I
Main system clock input terminal (4.5 MHz)
78
CE
I
CPU chip enable signal input (fixed at “H”)
79
VDD
—
Power supply terminal (+5V)
80
RESET
I
System reset signal input from the reset signal generator circuit and reset switch (S901)
“L” is input for several 100 msec after power on, then it changes to “H”
“L” is input for several 100 msec after power on, then it changes to “H”
*1 loading/tape operation motor control
MODE
TERMINAL
LM LOD (pin 8)
“L”
“H”
“L”
“H”
LM EJ (pin 9)
“L”
“L”
“H”
“H”
STOP
LOADING/
FORWARD
EJECT/
REVERSE
BRAKE
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