 Acer File Extensions |
Packard Bell 55 M/Board
Specification
- Battery : Tadiran 3.6V Lithium connected at location JP6.
- BIOS : 128K Phoenix BIOS Rel. D 1.01.07. To access setup, Ctrl-Alt-Esc
- Bus Architecture : ISA based system bus
- Cache : 16kb SRAM soldered on motherboard 32kb (2) 8Kbx8 (25ns) in U48 and U53 (optional). When 32k cache is installed on system, the CACHE32.COM program must be run to activate the cache on BIOS versions 1.10.14 and under.
- CPU : 80386SX-20 MHz. Turbo Switch Switchable Switch LED Speed : In Amber 8 MHz, Out Green 20 MHz
- Interfaces :
- 1 DB-25 Parallel Port
- 2 DB-9 Serial ports
- 1 PS/2 Keyboard Port
- 1 PS/2 mouse port
- 1 Ext. VGA Conn on expansion slot
- RAM : 2MB standard/16MB maximum. Use 256K, 1,or 4MB SIMMs, 80ns.
- Speaker : Piezoelectric onboard. Ext speaker can attach to JP16
- Video : Paradise Extended VGA Capable of 1024 X 768 @ 16 colours
- Video RAM : 512K
Jumpers
| Function | Jumper | Description |
|---|---|---|
| Reserved (JP2) | OPEN CLOSED | Reserved Reserved |
| Monitor Type (JP3) | OPEN CLOSED | Monochrome Colour |
| Reserved (JP4) | OPEN CLOSED | Reserved Reserved |
| PS/2 Mouse IRQ 12 (JP5) | OPEN CLOSED | Do not Use IRQ 12 Use IRQ 12 |
| 800x600 Frequency (JP7) | OPEN CLOSED | V-56Hz, H-35.2KHz V-60Hz, H-37.8KHz |
| Monitor Timing (JP8) | OPEN CLOSED | PS/2, Others Multi-Sync One |
| Video BIOS (JP9) | OPEN CLOSED | AT VGA Mode PS/2 VGA Mode |
| Reserved (JP10) | OPEN CLOSED | Reserved Reserved |
| Reserved (JP11) | OPEN CLOSED | Reserved Reserved |
| On-Board VGA (JP12) | OPEN CLOSED | Disabled Enabled |
| Non Volatile RAM (JP14) | OPEN CLOSED | Do not Clear CMOS Clear CMOS |
| Speaker Selection (JP15) | OPEN CLOSED | Off-Board Speaker On-Board Speaker |
| Reserved (JP18) | OPEN CLOSED | Reserved Reserved |
| Printer Port Type (JP30) | OPEN CLOSED | PS/2 Bi-Directional Centronics |
Upgrades
- Battery : Tadiran 3.6V Lithium connected at location J16.
- Cache : There are two 28-pin SRAM sockets, which upgrades the 16K cache to 32K, located at U48 and U53. The speed of the SRAM chips must be 25ns or faster.
- Maths Co-Processor : This system supports the 80387SX-20 math co-processor. It is installed at location U42. No jumper settings are required.
- RAM : 2MB standard/16MB maximum. Use 256K, 1MB,or 4MB SIMMs, 80ns. Shadow BIOS Enabled takes 128Kb off of Extended Memory. No jumper setting required.