In a message dated 12/18/98 1:10:45 AM EST, marvin(a)rain.org writes: << What you are looking for is called a TNC (Terminal Node Controller.) And surprise, surprise, this is all on topic as I have several TNCs designed for the C-64 (no, I'm not interested in getting rid of them.) Years ago, I sold a friend of mine an IBM PC (yes, PC) with two floppy drives that he used up to last year to monitor packet radio here in Santa Barbara. There is also a device/software IIRC called Baycom that can be connected to the serial or parallel port and will work for packet radio. I might add you also need a radio to monitor packet radio :) and a ham license to utilize it. at every radio rally i've been to, there is always someone displaying a TNC for the C64 that appears to directly plug into the computer. I have seen one TNC for sale, and it was ~$60. Unfortunately, i dont know anything about TNCs like if there's just one type that plugs into a serial port or whether there are other styles, but i do know you need a 2 meter radio and the license to run it. packet radio seems to run at 2400, but i almost certainly remember being told once that some were running at 9600.