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Acer A1G4 Motherboard

Jumper and connector layouts

A1G4 Motherboard Diagram

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

CPU Jumper Settings

 486ODP 486P24CP24DAMD 3.3vCYRIXUMCTi-Acer
JP111-21-21-21-21-22-31-22-3
JP121-21-21-32-31-21-21-22-3
JP132-31-21-21-21-21-21-22-3
JP182-32-32-31-22-32-32-32-3
JP202-32-32-32-32-31-22-32-3
JP30-32OpenOpenOpenOpenOpenClosedOpenOpen
JP331-21-21-21-21-22-31-21-2
JP34-36ClosedClosedClosedClosedOpenOpenClosedClosed
JP391-2,4-51-2,4-51-2,4-51-2,4-51-2,4-51-2,4-51-2,4-52-3,5-6
JP402-32-32-32-31-22-31-22-3
JP412-32-32-32-31-22-31-22-3
JP422-32-32-32-32-32-32-31-2
JP43OpenOpenOpenOpenOpenOpenOpenOpen
JP44OpenOpenPowerOpenPowerOpenOpenOpen
JP45CloseCloseBoardCloseBoardCloseCloseClose
JP461-21-21-22-31-21-21-21-2
JP471-21-21-21-21-22-31-21-2
JP48OpenOpenOpenOpenOpenOpenOpenOpen

CPU Clock Speed Settings

CPU ClockJP10JP17JP19CN14
40 MHz 1-21-22-32-6
33 MHz 2-32-32-33-7
25 MHz 2-32-32-34-8

Jumper Settings

JumperSettingFunction
JP22-3
1-2*
Enable password check
Bypass password
JP14Closed*
Open
Enable onboard VGA
Disable onboard VGA
JP16Open*
Closed
Enable onboard local bus IDE
Disable onboard local bus IDE
JP201-2
2-3*
Intel SL Enhanced or Cyrix CPU
Normal CPU
JP21Closed*
Open
Enable onboard super I/O chip
Disable onboard super I/O chip
JP281-2*
2-3
Enable onboard memory
Disable onboard memory
JP37-381-2*
2-3
Enable Reset button
Enable Suspend/Resume button

Connectors

ConnectorFeature
CN1VGA Feature connector
CN2Diskette drive connector
CN11Reserved
CN4Secondary IDE Connector
CN5Primary IDE Connector
CN6CPU Fan connector
CN8Multifunction connector

CN8 accommodates the front panel connectors for speaker, LEDs, keylock, reset, and turbo. The figure shows the pin assignments for each of the front panel connectors.

Multi Function Connector

Memory

Module Description : 72 - pin non-parity DRAM 70 ns Maximum : 32MB


Cache RAM

SizeData chipsTag chipJP30, JP31
128K 4 of 32Kb x 8 (U51-U54)32Kb x 8 (U32)1-2*
256K 8 of 32Kb x 8 (U40,U45-47,U51-54)32Kb x 8 (U32)2-3