NEC PC-8201 Service Manual page 31

(3) CMT interface
CMT &pin DIN CONNECTOR
C hiT
Pin number
1
2
3
4
5
6
7
8
Signal name
T x C
GND
GND
M IC
EAR
REM1
R EM2
Vcc
Remarks
TTL
level output
Signal ground
Electrical power ground
1 Output to MIC
Input from EAR
Remote terminal
Remote terminal
+5 V