Cpu Type Selection; Cpu Clock Selection - VESA 80486VESA User Manual

CPU Type Selection

The 80486VESA motherboard can accomodate either the Intel
486DX, 486DX2,486SX, 487SX, 486 Over Drive, 486SX/DX PQFP
or P24T. There are two jumpers to be set for the microprocessor
Selection. Configuration of the correct CPU setting will allow
compatibility with various low end and high end applications.
The jumper settings are:
-
486SX
486DX/486DX2
486 Over Drive 168-pin
487SX/487SX2
486 Over Drive 169-pin
P24T
486DX/486DX2
486 Over Drive 168-pin
487SX/487SX2
486 Over Drive 169-pin
P24T

CPU Clock Selection

The 80486 VESA motherboard uses a CPU frequency generator to
generate the clock instead of oscillator. There are three jumpers to be set
for the CPU clock selection. The jumper settings are:
50 MHz
40 MHz
33 MHz
25 MHz
20 MI
80486VESA User's Manual
Chapter 2: Configuration and Layout
486SX/DX-PQFP 1-2,3-4
-
-
l-2,3-4
-
l-2,3-4
486SX/DX-PQFP l-2,3-4
486SX/DX-PQFP l-2,3-4
Close
Open
Close
Close
Open
Close
Open Close
Close
Close
l-2 Close Open
2-3 Open Open Close
1-2 Open Close
2-3 Open Close
l-2 Open Close
2-3 Open Close
2-3
2-3
l-2
l-2
1-2
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