Packard Bell 800/900 M/Board

There are two revisions of the PB800/900 motherboard.

Revision C

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

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

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.