NEC PC-8201 Service Manual page 34

( 5 ) SIO1 Interface
S101
8-pin DuPont BERG modular jack
SIO
1
Pin number
1
2
3
4
5
6
7
8
Signal name
GND
TxD
RxR
RTS
CTS
Vcc
N C
N C
Remarks
Signal ground
Transmit data
Receive data
Request to
send
Transmission
authorized
+5 V
Not connected
Not connected