Cassette tape port
This port is compatible with Commodore datasette cassette tape drives made for the PET series, the VIC-20, as well as the Commodore 64. It is sometimes used to supply power to devices attached to the serial bus such as the SD2IEC.
|C,3||VIA #1 CA2||Cassette motor|
|D,4||VIA #2 CA1||Cassette read|
|E,5||VIA #2 PB3||Cassette write|
|F,6||VIA #1 PA6||Cassette switch|