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Packard Bell 400/401T M/Board

Specification

  • Battery : 3.6V DC NiCad soldered on motherboard
  • BIOS : 128 KB - Phoenix BIOS V1.01.08. Press Ctrl-Alt-S after post to access.
  • Bus Architecture : ISA based system bus
  • Cache : Write Back: 8 KB Internal (Level 1) Cache External (Level 2) 0 - 256 Kb
  • CPU : Intel 486 processor
  • Interfaces :
    • 1 DB-25 Parallel Port
    • 1 DB-9 Serial port
    • 1 PS/2 Keyboard Port
    • 1 PS/2 mouse port
    • 1 15-pin VGA
    • 1 15 pin Game (only with CL5424 Systems)
  • RAM : 2 MB or 4 MB Standard on Motherboard 6 MB or 18 MB or 20 MB Maximum
  • Speaker : Piezoelectric soldered on motherboard
  • Video : Built in Oak Extended VGA

Jumpers

FunctionJumperDescription
Battery (J8(Jbts))IN
OUT
* Onboard Battery Enabled
External Battery in Use
Onboard VGA (J10(Jvgas))1-2
2-3
* Enabled
Disabled
Game Port (J12(Jgams))2-3
1-2
* Enabled
Disabled
VESA Select (J14(Jvnde))IN
OUT
* Normal VGA in use
VESA Connector Enabled
Monitor Type (J16(Jvd))IN
OUT
* Colour
Monochrome
PS/2 Mouse Port (J17(Jmrq))IN
OUT
* Enabled
Disabled
Modem Port (J18(Jc13))1-2
2-3
* COM1
COM3
Serial Port (J20(Jc24))1-2
2-3
* COM2
COM4
LPT Port (J22(Jlpt))1-2
2-3
* LPT1
LPT2
LPT IRQ (J23(Jlrq))1-2
2-3
* IRQ7
IRQ5
IDE (J24(Jhdc))1-2
2-3
* IDE1
IDE2
FDC (J26(Jfdc))1-2
2-3
* FDC1
FDC2
Speaker (J29(Jspks))1-2
2-3
* Onboard Buzzer
External Speaker
CPU Select (J31(Jcpup))IN
OUT
Upgrade CPU Socket (U74)
* Original CPU Socket (U73)
Fast CPU (J34(Jfcpu))IN
OUT
80486DX2/OVERDRIVE in use
No Fast CPU
J101 (Jmod)1-2
2-3
Enabled
Disabled

Note - J101 - Not present on all motherboards.
Note - J14 - Enable VESA connector J13 for PBTV to function.

CPU Type (J30(Jcpus))

Processor1-23-45-67-89-10
80486sx PGAOUTINOUTOUTOUT
80486sx PQFPININOUTOUTOUT
80486DX
80486DX2
OVERDRIVE
INOUTININOUT
80487sxINOUTINOUTIN

CPU Clock (J35(Jfreq))

MHz1-23-4
16ININ
20OUTIN
25INOUT
33OUTOUT

Cache Size (J36(Jcach))

Cache1-23-45-67-89-10
0OUTOUTOUTOUTOUT
64OUTOUTOUTOUTOUT
128INOUTININOUT
256INININOUTIN
Note -
  • 0K - No CACHE Installed
  • 64K - 8Kx8 in both banks
  • 128K - 32Kx8 in even banks
  • 256K - 32Kx8 in both banks

Upgrades

  • Battery : This computer can use a 3.6 volt Lithium battery. To install the external battery, remove the cap on jumper J8. Then connect the battery to connector J7. The positive terminal of the battery connects to pin 1, and the ground terminal is connected to pin 4.
  • Cache : Cache can be upgraded as follows (See jumpers section for more information) -
    • 64K - 8Kx8 in both banks
    • 128K - 32Kx8 in even banks
    • 256K - 32Kx8 in both banks
  • CPU : This system accepts the following processors (See jumpers section for more information)
    • 486SX/20 PGA
    • 486SX/20 PQFP
    • 486SX/25 PGA
    • 486SX/25 PQFP
    • 486DX/33
    • 486DX2/50
    • 486DX2/66
  • RAM : There are 3 different configurations of this motherboard -
    • 2MB soldered DRAM and OPTi 82C495 System Controller - 256k or 1MB 30pin SIMMS up to a maximum of 6MB.
    • 2MB soldered DRAM and OPTi 82C495B1 System Controller - 1MB or 4MB 30pin SIMMS up to a maximum of 18MB.
    • 4MB soldered DRAM - 256k/1MB/4MB 30pin SIMMs up to a maximum of 20MB.
    • Recommended speed (all versions) 80ns, though 70ns should work.
  • Speaker : Use an 8 ohm, 1/2 watt computer speaker. Set jumper J29 to short pins 2 and 3. Then connect the speaker to J28, with the positive terminal of the speaker connected to pin 4, and the ground connected to pin 1.
  • Video Memory : The video DRAM sockets are 20-pin. The memory can be upgraded to 1MB. DRAM ordered for memory upgrade need to be 20-pin, speed 70ns. These are NOT proprietary DRAMs. Video mode 59h (1024x768, 256 colors) is always interlaced.