Apple Macintosh Performa 6300CD Series - Manual (Page 17)

2 Plug the keyboard cable into the port marked with the ◊ icon on the back of the
computer.
Some monitors have a port to which you can connect the keyboard or mouse.
See the information that came with your monitor.
3 If you want to adjust the keyboard angle, lower the feet on the keyboard.
To adjust the keyboard angle, lower the feet until they snap into position.
V ADB port
7 Getting Started