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Packard Bell 386 25 (Rev. D) M/Board

386 25 Rev D Motherboard Diagram

Specification

There are two motherboard versions. Rev. D has all simm sockets grouped together, Rev. F has them arranged in two groups.

  • Battery : DS1287 soldered on Motherboard
  • BIOS : 2 X 32K Phoenix BIOS Phoenix 1.10.20C1. To access setup, Ctrl+Alt+Ins
  • Bus Architecture : ISA based system bus
  • Cache : 64K, 35 ns
  • CPU : 80C386DX-25 MHz. Keyboard Switchable Ctrl-Alt-1 = 8 MHz, Ctrl-Alt-2 = 25 MHz. Use number keys on numeric pad.
  • Interfaces :
    • 1 DB-25 Parallel Port
    • 2 DB-9 Serial ports
    • 1 Keyboard Port
    • 1 Ext. VGA Conn 15 pin
  • RAM : 4MB standard Maximum on Motherboard 8 MB
  • Speaker : Piezoelectric, soldered on motherboard
  • Video : Oak, Trident, PBVGA Multi, or SVGA

Jumpers

FunctionJumperDescription
SIMM SpeedE1-E2, E4-E5100ns
SIMM TypeE55-E56
E53-E54, E55-E56
NONE
Static Column
Fast Paged
Standard RAS/CAS
SIMM SizeE7-E8, E10-E11
E8-E9, E11-E12
256k SIMM
1MB SIMM
Total RAMNONE
E61-E63
E60-E62
E60-E62, E61-E63
1MB
2MB
4MB
8MB
ROM SizeE57-E58
E58-E59
64K
128K
Keyboard ResetE34-E35
E35-E36
Enabled
Disabled
Math CoprocessorE28-E29
E29-E30
Installed
Not Installed
Monitor TypeE41-E42
E40-E41
Colour
Monochrome
Printer AcknowledgeE16-E17
E17-E18
Leading Edge
Trailing Edge
Parallel PortE13-E14
E14-E15
E19-E20
E20-E21
LPT1 Enabled
LPT1 Disabled
LPT2 Enabled
LPT2 Disabled
UNIX ModeE37-E38
E38-E39
UNIX System
Non-UNIX
Serial PortE22-E23
E23-E24
E25-E26
E26-E27
COM1 Enabled
COM1 Disabled
COM2 Enabled
COM2 Disabled

Upgrades

  • Battery : DS 1287 soldered on motherboard.
  • Maths Co-Processor : This system supports the 80387SX-25 math co-processor. It is installed at location U41. No jumper settings are required.
  • RAM : 4MB standard Maximum on Motherboard 8 MB. This board will accept RAS/CAS, Fast-Paged, or Static Column memory upto 8MB. SIMM type, either 256k or 1MB SIMMS, at a speed of 100ns. See the jumpers section for necessary jumper changes when upgrading memory.