This is the solution to the problem of Tie Fighter locking up on the IBM PS/1 2168 BB1 computer. This problem only seems to affect this one model, and it can be fixed by making one change in the jumper settings. There is a pair of pins above the processor labelled J37, and the pins are not connected by a jumper. To fix the problem, you need to put a jumper on these pins. There are no spare jumpers on the planar board, but you can remove the jumper from the speaker pins (disabling the internal speaker), and place this jumper on J37. Figure 1. Diagram of Planar board for 2168 BB1 *-----------------------------------------------+-----------------* | | | | Riser card with 8 adapter | | | card slots | | | | | | | | | | | | | | | | | |-----------------------------------------------* | | "J37 | | | | *------* | | |486 | | | |DX2 66| | | *------* | | | | /\ | | \/ " ' | *-----------------------------------------------------------------* speaker spkr jumper " - one pair of pins ' - one lone pin With the J37 pins jumpered, the next time you turn on your system, your 486 DX2 66MHz processor will run at the speed of 50MHz. You may notice that the system is a bit slower, but it is still a faster 486 which meets the optimum system requirements of the newer games. Your processor is still rated to run at 66MHz, and you can reverse the instructions (move the jumper from J37 back to SPKR) to return the system speed to 66MHz.