ABit AB-AH4
chipChipset
cpuCPU socket
Socket 3 (PGA237)
cpuCPU family
486 (5V)
speedFSB speeds
20MHz25MHz33MHz50MHz
chipCache
128KB256KB512KB
ramRAM type
72-pin FPM
ramMax RAM size
128MB
pwrPSU connector
AT (P8-P9)
moboForm factor
Baby AT (max 220 x 330 mm)
dimDimensions
330mm x 218mm
connI/O ports
1x 
AT Keyboard
cardExpansion slots
1x 
8-bit ISA
7x 
16-bit ISA
3x 
32-bit VLB

Known issues:

  • Leaky Ni-Cd clock battery

The Ni-Cd battery may be leaking, risking damage to PCB layers & nearby components. Promptly remove the battery & clean corrosion/alkaline salts from the board. Use white vinegar to dissolve salts, but exercise caution as vinegar can corrode exposed metals. A thorough examination & repair may be needed. Replace battery with guide: https://github.com/wiretap-retro/Not-A-Varta

Notes:

Does not support 486DX4 CPUs! Only the AH4T supports 486DX4.

Last updated 2022-12-19T08:32:59Z
 TRW ID: 70
drv 0 drivers available
3 BIOS images available
Manuf.
POST string
Note
Core Ver.
BIOS Ver.
Manuf.
AMI
POST string
40-E8FI-001247-00101111-121593-SIS471-F
Note
Core version
121593
BIOS version
Manuf.
AMI
POST string
40-PDHF-001247-00101111-072594-SIS471G
Note
Core version
072594
BIOS version
Manuf.
Award
POST string
03/08/95-SIS-85C471E/G-2C4I9A12-02
Note
Core version
4.50G
BIOS version
Manuf.
Award
POST string
08/30/95-SIS-85C471E/G-2C4I9A12-02
Note
Hacked bios with WB L2
Core version
4.50G
BIOS version
doc 2 documents available
Language
File
Language
English
File
Language
English
File
doc 0 other files available

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