 Acer File Extensions |
Acer A1G4 Motherboard
Jumper and connector layouts
Note - The blackened pin of a jumper represents pin 1.
CPU Jumper Settings
| 486 | ODP 486 | P24C | P24D | AMD 3.3v | CYRIX | UMC | Ti-Acer | |
|---|---|---|---|---|---|---|---|---|
| JP11 | 1-2 | 1-2 | 1-2 | 1-2 | 1-2 | 2-3 | 1-2 | 2-3 |
| JP12 | 1-2 | 1-2 | 1-3 | 2-3 | 1-2 | 1-2 | 1-2 | 2-3 |
| JP13 | 2-3 | 1-2 | 1-2 | 1-2 | 1-2 | 1-2 | 1-2 | 2-3 |
| JP18 | 2-3 | 2-3 | 2-3 | 1-2 | 2-3 | 2-3 | 2-3 | 2-3 |
| JP20 | 2-3 | 2-3 | 2-3 | 2-3 | 2-3 | 1-2 | 2-3 | 2-3 |
| JP30-32 | Open | Open | Open | Open | Open | Closed | Open | Open |
| JP33 | 1-2 | 1-2 | 1-2 | 1-2 | 1-2 | 2-3 | 1-2 | 1-2 |
| JP34-36 | Closed | Closed | Closed | Closed | Open | Open | Closed | Closed |
| JP39 | 1-2,4-5 | 1-2,4-5 | 1-2,4-5 | 1-2,4-5 | 1-2,4-5 | 1-2,4-5 | 1-2,4-5 | 2-3,5-6 |
| JP40 | 2-3 | 2-3 | 2-3 | 2-3 | 1-2 | 2-3 | 1-2 | 2-3 |
| JP41 | 2-3 | 2-3 | 2-3 | 2-3 | 1-2 | 2-3 | 1-2 | 2-3 |
| JP42 | 2-3 | 2-3 | 2-3 | 2-3 | 2-3 | 2-3 | 2-3 | 1-2 |
| JP43 | Open | Open | Open | Open | Open | Open | Open | Open |
| JP44 | Open | Open | Power | Open | Power | Open | Open | Open |
| JP45 | Close | Close | Board | Close | Board | Close | Close | Close |
| JP46 | 1-2 | 1-2 | 1-2 | 2-3 | 1-2 | 1-2 | 1-2 | 1-2 |
| JP47 | 1-2 | 1-2 | 1-2 | 1-2 | 1-2 | 2-3 | 1-2 | 1-2 |
| JP48 | Open | Open | Open | Open | Open | Open | Open | Open |
CPU Clock Speed Settings
| CPU Clock | JP10 | JP17 | JP19 | CN14 |
|---|---|---|---|---|
| 40 MHz | 1-2 | 1-2 | 2-3 | 2-6 |
| 33 MHz | 2-3 | 2-3 | 2-3 | 3-7 |
| 25 MHz | 2-3 | 2-3 | 2-3 | 4-8 |
Jumper Settings
| Jumper | Setting | Function |
|---|---|---|
| JP2 | 2-3 1-2* | Enable password check Bypass password |
| JP14 | Closed* Open | Enable onboard VGA Disable onboard VGA |
| JP16 | Open* Closed | Enable onboard local bus IDE Disable onboard local bus IDE |
| JP20 | 1-2 2-3* | Intel SL Enhanced or Cyrix CPU Normal CPU |
| JP21 | Closed* Open | Enable onboard super I/O chip Disable onboard super I/O chip |
| JP28 | 1-2* 2-3 | Enable onboard memory Disable onboard memory |
| JP37-38 | 1-2* 2-3 | Enable Reset button Enable Suspend/Resume button |
Connectors
| Connector | Feature |
|---|---|
| CN1 | VGA Feature connector |
| CN2 | Diskette drive connector |
| CN11 | Reserved |
| CN4 | Secondary IDE Connector |
| CN5 | Primary IDE Connector |
| CN6 | CPU Fan connector |
| CN8 | Multifunction 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. |
Memory
Module Description : 72 - pin non-parity DRAM 70 ns Maximum : 32MB
Cache RAM
| Size | Data chips | Tag chip | JP30, 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 |