Connectors Commodore 128

Power Connector

 

Serial Connector

Audio / Video Connector

RGBI Video port (80 column video)

 Joystick Connectors

The Joystick ports are connected to CIA 1 in parallel to the keyboard matrix.
To read the direction from the joystick you can read the memory locations 56321/DC01 for port 1 and 56320/DC00 for port 2.

Datasette Connector

Userport Connector

The userport PB0-PB7 is connected to the CIA 2 port B and is controllable by setting the right direction bits in the Data Direction Register Byte (DDRB) on address 56579 ($DD03).
And writing or reading the port on address 56577 ($DD01).
Note, when using the RS-232 functions (open 2,2,2) will change the DDRB.

Expansion Port

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