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Acer M3 Motherboard and CPU Boards

Jumper and Connector Layout

M3 Motherboard Diagram

Jumper Settings

JumperSetting Function
JP1 Password1-2
2-3		Check password
Bypass password
JP2Reset buttonOpen
Closed		Reset button disabled
Reset button enabled
JP3 BIOS type1-2
2-3		Acer BIOS
OEM BIOS
JP4 RTC NVRAM 1-2
2-3		128 bytes or 256 bytes
4KB, reserved
JP6 Sound Output1-2
2-3		Buzzer
Speaker

Connector Functions

ConnectorFunction
J4COM2 connector
J5COM1 connector
J6 (PRN)Parallel connector
J8Power connector
J9IDE connector
J10Diskette drive connector
J16EIDE1 connector *
J17EIDE2 connector *
J15SCSI connector *
J19Power LED connector
J20HDD LED connector

* A SCSI or EIDE version of the board was available. The SCSI version had no EIDE connectors and vice-versa.

Memory

Memory Module : 72pin Parity 70ns Maximum : 128MB


ALI Pentium CPU Board 3.3v (PCB 94414-1)

ALI Pentium CPU Board Diagram
JumperSettingFunction
JP1
CPU Clock		Open
1-2
2-3		 50 MHz
60 MHz
66 MHz
JP4 CPU
Voltage		1-2
2-3 		VR (3.3V ~ 3.465V)
VRE (3.45 ~ 3.6V)
JP5, JP7
L2 Cache		1-2, 1-2
2-3, 2-3		256KB cache size
1MB cache size
JP8
Bus/Core Ratio 		Closed
Open		2/1 (60/120 MHz, 66/133 MHz)
3/2 (60/90 MHz, 66/100 MHz)
JP2OpenReserved
JP62-3Reserved


Pentium CPU Board 3.3v (PCB 94323-1)

Pentium CPU Board Diagram
Jumper Settings
JumperSettingFunction
JP1
CPU Type		1-2
2-3		Pentium 90
Reserved

Key to diagram

1 Second-level cache 6 LBX
2 Voltage regulator 7 LBX
3 CPU socket 8 PCMC
4 Fan connector 9 Oscillator
5 JP1