ATEN CS-72A - Manual (Page 15)

Troubleshooting Notes:
1. The unit is designed to work with AT and PS/2 keyboards.
Older XT (84 key) and some older AT keyboards (those with
the function keys on the side), will not work.
2. Some Notebooks, notably the IBM Thinkpad and Toshiba
Tecra, have trouble when their mouse and keyboard ports
are used simultaneously. To avoid this, only connect the
mouse port or the keyboard port. If you connect the mouse
port, you will need to use the notebook’s keyboard when the
notebook becomes the active computer.
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