You're welcome dagwood systems. I assume you're referring pin 20 on a Db25 connector for 'DTR high', meaning for a modem. I think I could usually get a modem operational with pins 1,2,3,4,5, 6 & 20. 7 was sometimes connected to 1 (ground).I wouldn't consider this totally off topic - I'm told the company that supports the 5E remotely 'dials in' a couple times a day via modem.

The other terms you mentioned I consider common. Even T, R, A, A1, LG, L I understand.

Last edited by Keyset6; 09/13/22 02:45 AM.