Both the IntelliMouse and the MX300 were tried with the PAK VIA. Both worked with the following changes: First, a 10K pull up resistor was added to the mouse clock pin. I assume that the pull up resistor is required to indicate to the mouse that PS2 mode is required. Second, a warm reset of the PAK VIA and mouse are required after power-on. After the warm reset, a delay is required before either mouse can be used. The IntelliMouse requires 1.6 seconds delay and the MX300 requires 1.1 seconds delay.
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