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Acer M3 Motherboard and CPU Boards

Jumper and Connector Layout

M3 Motherboard Diagram

Jumper Settings

Jumper	Setting	Function
JP1 Password	1-2 2-3	Check password Bypass password
JP2Reset button	Open Closed	Reset button disabled Reset button enabled
JP3 BIOS type	1-2 2-3	Acer BIOS OEM BIOS
JP4 RTC NVRAM	1-2 2-3	128 bytes or 256 bytes 4KB, reserved
JP6 Sound Output	1-2 2-3	Buzzer Speaker

Connector Functions

Connector	Function
J4	COM2 connector
J5	COM1 connector
J6 (PRN)	Parallel connector
J8	Power connector
J9	IDE connector
J10	Diskette drive connector
J16	EIDE1 connector *
J17	EIDE2 connector *
J15	SCSI connector *
J19	Power LED connector
J20	HDD 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)

Jumper	Setting	Function
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)
JP2	Open	Reserved
JP6	2-3	Reserved

Pentium CPU Board 3.3v (PCB 94323-1)

Jumper Settings
Jumper	Setting	Function
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