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Packard Bell 800/900 M/Board

There are two revisions of the PB800/900 motherboard.

Revision C

800a board diagram

NOTE: Holds 1MB of RAM (256 x 1 chips), arranged in four rows of nine chips per row (8 bits of RAM and 1 parity bit.) The CMOS backup battery is a removable AT style battery.

Revision D

800b board diagram

Holds 1MB of RAM (256K x 4 chips) arranged in 2 rows of 4 and parity 1 row of 4 (256K x 1 chips) upgradeable to 2MB with same chips plugged in adjacent sockets. CMOS Battery is soldered.

Specification

2 motherboard revisions: Rev.C requires matching BIOS and Chips chipsets. Supports 1MB. Rev.D supports 2MB on motherboard. There is no difference between the PB800 and the PB900.

  • Battery : 3.6V DC NiCad
  • BIOS : 2 X 32KB - Phoenix 3.10.14 BIOS. To access setup, Ctrl-Alt-S
  • Cache : N/A
  • Clock/Driver : (RTC)
  • Cover Removal : 5 on back panel
  • CPU : 80286-12 MHz, 80286-16 MHz. Keyboard Switches: (Ctrl)-(Alt)-(+) = 12/16 MHz, (Ctrl)-(Alt)-(-) = 8 MHz.
  • Drive Cavities : 2 X 5 1/4" half (exposed). 1 X 5 1/4" half (enclosed)
  • I/O Expansion slots : 6 x 16-bit ISA (5 open). 2 x 8-bit ISA (1 open)
  • Interfaces :
    • 1 DB-25 Parallel Port
    • 1 RS-232, DB-9 Serial Port
    • 1 RS232, DB-25 Serial Port
    • 1 5-pin DIN Keyboard Port
  • Power Supply : 145 watts, 110/220 v 50/60 Hz
  • RAM : Standard on motherboard : 1 MB. Maximum on motherboard : Rev.c 1 MB Rev.d 2 MB
  • Speaker : Internal - cone on front
  • Video : On expansion slot

Jumpers

JumperFunctionPinsDescription
J1980287 Clock Speed1-2
3-4
80287-8
80287-10
COLOUR/MONODisplay Mode1-2
2-3
Colour
Monochrome

Upgrades

  • Cache Memory : This system does not support cache memory.
  • Maths Co-Processor : This system will support an 80287-8 math coprocessor. It should be installed at location U16. Set J19 to pins 1-2. This system will also support an 80287-10 math co-processor. It should be installed at location U16. A 30-32MHz crystal need to be installed at U17. Set J19 to pins 2-3.
  • RAM : Maximum on motherboard : Rev.c 1 MB Rev.d 2 MB. Use 256k chips, 100ns.
  • Video Memory : This system has a video card installed. Replace the video card for video memory upgrades.