486-GIO-VT Item: AMD DX-4 100 Jumper settings AMD DX4-100 (33.3*3=99.9Mhz @ 100Mhz) JC1 & JC2 -------- 1-2 JC3 -------------- OPEN JC4 -------------- 1-2 JC7 -------------- SHORTED JC5 -------------- SHORTED RN20 ------------- EMPTY RN21 ------------- INSERTED RN22 ------------- EMPTY JC6 -------------- EMPTY JK1 -------------- 2-3 JK2 -------------- 2-3 JK3 -------------- 1-2 JK4 -------------- 1-2 If it doesn't work, you can try below jumper setting.(50*2=100Mhz) JC6 -------------- 1-2 JK1 -------------- 2-3 JK2 -------------- 1-2 JK3 -------------- 2-3 JK4 -------------- 2-3