Brand new used C-64 PC

Hi, That's correct. Almost all peripherals attach to the "serial" connector, you simply daisychain one peripheral off of the previous one. There are a very few peripherals that connect to the cartridge port and still fewer that connect to the user port - about the only thing I recall that used the user port was a printer interface and CBM's own RS-232 "cartridge". Not if it attaches to the "serial" connector. The "serial" bus is actually a bastardised implementation of the IEEE-488 bus, which CBM had used on the PET series. Data is transferred serially (at 300 baud) instead of in parallel, other than that I believe it's pretty much IEEE. That's correct, however, the "user port" is able to emulate an RS-232 port in software....BUT you need some external circuitry to buffer the signals and convert them to RS-232 levels. As I mentioned above, CBM used to produce such a unit and I'm sure many other companies did too. I built my own buffer, all you need is a MAX-232 chip and a handful of resistors and capacitors. TTFN - Pete. -- Hardware & Software Engineer. Sound Engineer. Collector of Arcade Machines, Games Consoles & Obsolete Computers (esp DEC) peter.pachla(a)wintermute.org.uk | www.wintermute.org.uk --