I have a PC-1A here's the 'standard wiring'
Pin
1 Mic
2 Stby (PTT)
3 Down
4 Up
5 Aux 1
6 Aux 2
7 Mic Ground
8 Stby Ground (PTT GND)
You can hook 7 & 8 together
If you'd like me to scan the 6 page document and email it to you, send me your email address.
73, Dave KD5FX
kd5fx@qsl.net