You do need to set both jumpers to match the type of card you have installed. These jumpers sit side by side near the middle of the motherboard on the right side of the daughter card connector.
J100: CLK90 Clock Source
1-2 Closed:(Internal CLK for 68020/68030)
2-3 Closed (External CLK for 68040)
J104: CPU Clock Source
1-2 Closed: Internal
2-3 Closed (External CLK for 68040)
Plaz
