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Packard Bell 300/320 M/Board

Specification

This motherboard's built-in video card does not have a 132-column mode as stated in the manual. Systems with "PB320" on the back stickers are 20MHz PB300 series computers.

  • Battery : 3.6V DC NiCad soldered on motherboard
  • BIOS :
    • 2 X 64K Phoenix BIOS Chip at U40: Phoenix 1.10.1110
    • No chip at U40: Phoenix 1.10.1111
    • No chip at U40 and ACC micro chip with SC01 at the end: Phoenix 1.10.1114
    • To access Setup : Ctrl-Alt-S
  • Bus Architecture : ISA based system bus
  • Cache : N/A
  • CPU : 80386SX-16 MHz, 80386SX-20 MHz. Keyboard Switchable (Ctrl)-(Alt)-(-) = 8 MHz, (Ctrl)-(Alt)-(+) = 16/20 MHz.
  • Interfaces :
    • 1 DB-25 Parallel Port
    • 1 DB-9 Serial ports
    • 1 15 pin VGA port
    • 1 Proprietary modem connector
    • 1 15 pin game port
    • 1 PS/2 Keyboard port
    • 1 PS/2 Mouse port
  • RAM : 1MB standard, Maximum on Motherboard 16 MB
  • Speaker : Piezoelectric, soldered on motherboard
  • Video : Paradise built into motherboard
  • Video RAM : 256K

Jumpers

Notes -

When replacing the motherboard and installing or removing a modem, ensure that the JMOD connector is configured properly.

There are about 100 motherboards, similar to Motherboard A, that have 8 SIMM sockets; only four are enabled.

There are three revisions to this motherboard.

  • Motherboard A - has 1MB surface mount DRAMs upgradable to 5MB.
  • Motherboard B -
    • Does not have surface mount DRAMs upgradable to 16MB.
    • There are 4 sets of traces for SIMM sockets in front of bank 0 and bank 1 labelled sim5,sim6,sim7 and sim8. Additional SIMM sockets cannot be installed.
    • U40 is only present on 20MHz system.
  • Motherboard C -
    • Has 2MB surface mount DRAMs; CPU is 16, 20 or 25MHz.
    • A 301-252 (256K video memory) on-board video disabled and a 512K OAK video card.
    • A 301-V252 has 512K of video memory in addition to a 25 MHz CPU.

Some computers have the game port jumpers reversed (1-2 Enabled 2-3 Disabled).

JLPS, JC24, JHDC, JFDC and JC13 will be obstructed by the internal modem connected to JMOD (if installed).

FunctionJumperDescription
Jfdc (FDC)1-2
2-3
Enabled
Disabled
Jhdc (IDE)1-2
2-3
Enabled
Disabled
Jc13 (COM1/COM3)1-2
2-3
Proprietary Modem in COM1
Proprietary Modem in COM3
Jc24 (COM2/COM4)1-2
2-3
Serial Port is COM2
Serial Port is COM4
Jlps (LPT PORT)1-2
2-3
Select LPT1
Select LPT2
Jlrq (LPT INT)1-2
2-3
LPT uses IRQ5
LPT uses IRQ7
Jvrq (VGA INT)IN
OUT
Video uses IRQ9
None
Jmrq (MOUSE INT)IN
OUT
Mouse Port uses IRQ12
None
Jvgas (VGA PORT)1-2
2-3
Built-in VGA Enabled
Built-in VGA Disabled
Jgams (GAME PORT)1-2
2-3
Disabled
Enabled
Jvd (DISPLAY)1-2
2-3
Mono Mode
Colour Mode
Jpip (PIPELINE)IN
OUT
Pipelined 80386
Non-pipelined 80386

Upgrades

  • Battery : 3.6V DC NiCad soldered onto motherboard.
  • Maths Co-Processor : An 80387SX Co-processor can be installed in socket U41, no jumpers need to be changed. Co-processor speed must match system speed.
  • RAM :
    • When upgrading any one of these systems, use SIMMs that have 9 chips on them rather then the ones with 3 chips.
    • There are 2 variations of motherboard for this system, each one with different memory configuration, see tables below.
    • SHADOW BIOS and SHADOW VIDEO take 128k off Extended Memory if either or both enabled.
    • No Jumper setting required.
    • Recommended SIMM speed is 80 ns.

Motherboard A - RAM Upgrade

System with surface mount DRAMs (44256s and 41256s) totaling 1MB, and 4 SIMM sockets. (Supports 256Kb and 1MB SIMMs only).


Total
Memory    
Dram
Bank 0
Dram
Bank 1
Simm
Bank 2
Simm
Bank 3
Extended
Memory
1MB(8)44256    (4)41256    NONENONE384
2MB(8)44256(4)41256(2)256K X 9    (2)256K X 9    1408
3MB(8)44256(4)41256(2) 1MB X 9NONE2432
5MB(8)44256(4)41256(2) 1MB X 9(2) 1MB X 94480

Motherboard B - RAM Upgrade

System with NO surface mount DRAMs, and 4 SIMM sockets. (Supports 256Kb, 1MB and 4MB SIMMs).

Total
Memory    
Simm
Bank 0
Simm
Bank 1
Extended
Memory
1MB(2)256K X 9    (2)256K X 9    384
2MB(2) 1MB X 9NONE1408
4MB(2) 1MB X 9(2) 1MB X 93456
8MB(2) 4MB X 9NONE7552
16MB(2) 4MB X 9(2) 4MB X 915744