CPU Upgrade Jumper Setting for P/I-486SP3G Motherboard

CPU Support and Jumper Setting for P/I-486SP3G Motherboard

AMD486DX4-SV8B AMD486DX4-NV8T Cx486DX4(3.45V) JP30 2-3 short JP31(pin 1) & JP32(pin 1) short JP34 2-3 short JP35 2-3 short JP36 1-2 short	i486DX2-&EW (P24D) Intel P24T JP30 1-2 short JP31 1-2 short JP32 1-2 short JP34 2-3 short JP35 2-3 short JP36 2-3(WT), 4-5 short	Intel DX2, DX4 DX4ODPR100, 487SX/ODP JP30 1-2 short JP31 1-2 short JP32 1-2 short JP34 2-3 short JP35 1-2 short JP36 2-3 short
i486DX4-&EW JP30 1-2 short JP31 1-2 short JP32 1-2 short JP34 2-3 short JP35 1-2 short JP36 1-2 short	Intel 486SX/SX2 JP30 1-2 short JP31 1-2 short JP32 1-2 short JP34 1-2 short JP35 1-2 short JP36 2-3 short	Intel 486DX4-100(3V) JP30 1-2 short JP31(pin 1) & JP32(pin 1) short JP34 2-3 short JP35 1-2 short JP36 2-3 short

Unfortunately, because Intel Saturn II Chipset has limitations, the following points should be noted:
1. There is a problem supporting some operating systems using the Cyrix M1sc CPU and Intel Pentium Overdrive P24T. We do not recommend that use these CPUs for P/I-486SP3G.
2. Using SCO UNIX with Intel 486DX2-&EW (P24D), please short 2-3 of JP36 jumper for Write Through, in stat of, 1-2 short. Write Back, default setting mode, is not supported with this combination of P24D and SCO UNIX.

Note that JP36 is used for selecting x2/x3 internal clock of AMD DX4 CPU. For Intel P24D/P24T CPU, it is used for selecting internal cache write-back (W.B.) or write-through (W.T.). So please short 1-2 of JP36 for AMD DX4 CPU.

JP36	Intel CPU	AMD DX4 CPU
1-2	W.B. Cache	3x clock
2-3	W.T. Cache	2x clock

CPU SL Setting

CPU Type	JP30	JP31	JP32
Non-SL CPU	2&3	JP31 Pin-1 & JP32 Pin-1 short
SL CPU	1&2	1&2	1&2

Intel CPU Internal Clock Setting

Clock	JP33
2x Ext.	2&3
2.5x Ext.	1&2
3x Ext.	Open

CPU External Clock Setting

CPU External Clock	JP18	JP20
25 MHz	2&3	2&3
33MHz	1&2	1&2

CPU Voltage Setting

Clock Speed	JP40
Intel DX4, 3.45 Volt	2&3
Cyrix DX2-50, 3.6 Volt	1&2

Last-Modified: 08/05/96 by Steven Chou
Copyright (C) 1995 ASUSTeK COMPUTER INC.