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Acer V20 Motherboard

Jumper and Connector Layout

V20 Motherboard Diagram

Note - The blackened pin of a jumper represents pin 1.

CPU Jumper Settings

 JP17JP21*JP26JP27
Intel
25 MHz1-52-31-21-2
33 MHz2-62-31-21-2
50 MHz1-52-31-21-2
66 MHz2-62-31-21-2
100 MHz2-62-31-21-2
AMD 
66 MHz2-62-32-32-3
100 MHz2-62-32-32-3
*NB on most systems JP21 was replaced by a solder link

Jumper Settings

Jumper SettingFunction
JP1
Password
1-2*
2-3
Check Password
Bypass Password
JP2
BIOS Select
1-2*
2-3
Acer BIOS
OEM BIOS
JP8
M5115 Func.
1-2*
2-3
Enable M5115
Disable M5115
JP9,JP20*
CPU Type
1-2,2-3
2-3,1-2
P24D/P24T (Overdrive)
486-S
JP11
IDE I/O address
1-2*
2-3
Local IDE I/O address select 0FXH
Local IDE I/O address select 07XH
JP121-2
2-3*
Disable local IDE
Enable local IDE
JP22
DX4 Clock
1-2
2-3
3-4
x 3 (tripled)
x 2.5
x 2 (doubled)
JP231-2*
2-3
Enable reset button
Disable reset button
JP241-2
2-3*
Reset becomes Suspend function
Normal reset function
Non-Configurable Jumpers
JP33-4
JP41-2, 3-4, 5-6
JP62-3
JP72-3
JP101-2

Connector Functions

ConnectorFunction
NC1Serial port 2
NC2Serial port 1
NP1Parallel port
CN1Game port connector
CN3Secondary IDE connector
CN4Primary IDE connector
CN5Floppy drive connector
CN8HDD LED connector
CN9Acer Multifunction connector
CN10Multifunction connector

Memory

4/8/16 MB 72 Pin, 70ns, Non-Parity Fast Page Mode SIMMS with gold tips. You cannot mix and match parity and non-parity memory within a bank. Maximum : 64MB


Cache RAM

 Data chips Tag chip JP13JP15JP16
 U38-41U47-50 U31   
128K32K x 8 empty 32K x 82-32-31-2
256K32K x 832K x 832K x 82-31-22-3
512K128K x 8 empty32K x 81-21-21-2