Packard Bell 286 IS/VT286 M/Board
Specification
NOTE: PB286 with the old motherboard is also known as the IS/VT286.
- Battery : 3.5 Lithium, removable
- BIOS : 2 x 32KB - Packard Bell 3.90P. TO access Setup, Run SETUP.EXE Program
- Cache : N/A
- Clock/Driver : (RTC)
- Cover Removal :
- PB286 : 2 screws on front under slide covers
- IS/VT286 : 5 screws on edge of rear panel
- CPU : 80286-10MHz 80286-12MHz
- PB286 - Keyboard Switchable (Ctrl)-(Alt)-(+) = 12 MHz. (Ctrl)-(Alt)-(-) = 8 MHz
- IS/VT286 Hardware Switchable Speed Select Button - Speed Turbo Position : 12, STD Position : 8
- Drive Cavities : 3 X half-height (exposed), 2 X half-height (enclosed)
- I/O Expansion slots : 5 x 16-bit ISA, 3 x 8-bit ISA
- Interfaces :
- 1 DB-25 Parallel Port
- 1 RS-232, DB-9 Serial Port
- 1 5-pin DIN Keyboard Port
- 1 PS/2 Mouse Port
- 1 15-pin VGA Port
- Power Supply : 210 watts 115v: (50Hz) /230v: (60)
- RAM : Standard on motherboard : 640Kb Maximum on motherboard : 1MB
- Speaker : Internal - cone on chassis
- Video : PB-EGA or PB-EGA/RS on expansion slot.
DIP Switches
The PB286 has 2 motherboard revisions, the IS/VT286 is the old motherboard.
The old version of this motherboard does not have DIP SWITCH 1
Dip Switches (SW1)
| Switch | Function | Pins | Description |
|---|
| S1 | RAM Size | ON
OFF | 640k or 640k + 384k
256k or 512k |
| S2 | RAM Size | ON
OFF | 512k or 640k + 384k
256k or 640k |
| S3 | System Clock | ON
OFF | Low
High or Middle |
| S4 | System Clock | ON
OFF | Middle or Low
High or Low |
| S5 | Reserved | OFF | |
| S6 | Reserved | OFF | |
| S7 | Display Mode | ON
OFF | Colour
Monochrome |
| S8 | 287 Clock Select | ON
OFF | 10 MHz
4.77 MHz |
SW2 Settings (ROM Selector)
| Switch | Function | Pins | Description |
|---|
| S1 | ROM Size | ON
OFF | 128k
256k |
| S2 | ROM Size | ON
OFF | 128k
256k |
| S3 | ROM Size | ON
OFF | 256k
128k |
| S4 | ROM Size | ON
OFF | 256k
128k |
Upgrades
- Cache Memory : This system does not support cache memory.
- Maths Co-Processor : A math co-processor can be installed in U99, no jumpers need to be changed. Use a 80287-6 for 6-8-10 MHz systems and a 80287-8 for 12 MHz systems.
- RAM : Upgradeable to 1MB by adding (4)256Kx4 and (2)256Kx1. If you want to install Memory Card(s), in your 1 MB RAM system, be sure to select SW1-1 ON, SW1-2 OFF.
- Video Memory : This system has a video card, upgrade depends on card.