This is an old revision of the document!
Table of Contents
Commodore plus/4
The Commodore plus/4 is a home computer from the 1980s and typical with other computers of that era comes with a built-in keyboard and was designed to connect to a television set.
The +4 has a number of built in I/O interfaces. These include a serial UART, 8-bit parallel port, cassette port and a CBM IEC serial bus.
The video output can drive composite video inputs on TVs or, for example, a Hauppauge HVR900H capture board in Linux (see photo). This setup has low latency and is very usable in Linux, but this may not be the case elsewhere.
Pinout
User port
1 2 3 4 5 6 7 8 9 10 11 12 GND 5V RES *P2 P3 P4 P5 RxC ATN 9V 9V GND GND P0 RxD RTS DTR P7 DCD P6 P1 DSR TxD GND A B C D E F H J K L M N *CST SENSE
Memory map
| Address | Device | Function |
|---|---|---|
| $FD10 | MOS 6529B | User port P0..P7 |
