Sony XR-C4100, Service Manual

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Pin No. Pin Name I/O Function
69 UNISO O Serial data output to the bus interface (IC701) (for SONY bus)
70 UNISI I Serial data input from the bus interface (IC701) (for SONY bus)
71 UNICKO O Serial data transfer clock signal output to the bus interface (IC701) (for SONY bus)
72 BUSON O Bus on/off control signal output to the bus interface (IC701) (for SONY bus) “L”: bus on
73 SYSRST O Reset signal output to the bus interface (IC701) (for SONY bus) “L”: reset
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 VDD1 — Power supply terminal (+5V)
80 RESET I
System reset signal input from the reset signal generator (IC502) and reset switch (S503)
“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