I built my first packet modem from a kit and ran it on my Commodore 64/Icom 28H. It was fun. I used a Microlog AIR-1 to run RTTY on my loaner Swan 270B (and got chewed out by my elmer for doing so!) Still have my C64 and my VIC20. My favorite VIC20 game was Radar Ratrace. In the late 80s I'd go to Kmart and buy VIC20 game cartridges for as little as $5 each.