Morton Jim@LLL-MFE.ARPA (05/21/85)
From Morton Jim[702,703]@CCC.MFENET on May 21, 1985 at 9:39 PDT Subject & Phone: packet On the serial link, try a cable with just pins 2,3,7 . this is the minimum cable that will work, just transmit & recieve data and ground. you should be able to short pin 2 to 3 on the tnc end of the cable (without the tnc connected) and what you type on keyboard should echo to the screen. if this does not work, you need some pins connected together on the commodore end of the cable. possibly 4,5,8,20 all tied together. try it again. once you can reliably type with this "loopback" configuration, you can connect the tnc and it should work. if not, i would venture to say something is wrong with the rs-232 driver in the tnc. perhaps its levels are ok for the epson but not for the commodore. i had many problems trying to use a commercial data cable. i made one with two connectors and 3 conductors of ribbon cable that has worked quite reliably. good luck. jim morton WA6FWW