PowerTech MB459
Chipset
Socket 
FSB speeds 25MHz33MHz40MHz50MHz
Form factorBaby AT (max 220 x 330 mm)
Dimensions220mm x 250mm
Cache
0B128KB256KB512KB
Max RAM size
64MB
RAM type 72-pin FPM
PSU connector
Also known as
- PowerTech MB 459 UMC 486 SUPER DEEP GREEN PC
I/O ports1x
AT Keyboard
Expansion slots6x
16-bit ISA
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
Add support for 3.3V CPUs by soldering LT1085CT, manual pg.8.
Last updated 2025-07-30T19:28:21Z
Board info score is 9.4/10
Chips
CPU family support
3 BIOS files available
AMI - 1 entry
POST string
Note
Core Ver.
BIOS Ver.
Logs
POST string
40-P301-001815-00101111-072594-UMC498
Note
Core version
072594
BIOS version
Logs
Award - 4 entries
POST string
Note
Core Ver.
BIOS Ver.
Logs
POST string
10/20/94-UMC-498GP-2C4X6000-00
Note
Core version
4.50G
BIOS version
MB45XB
Logs
POST string
02/07/95-UMC-498GP-2C4X6000-00
Note
Core version
4.50G
BIOS version
Logs
No drivers available
1 board document available
Release date
File
Logs
Chip
Release date
File
Logs
Family
Release date
File
Logs
Image 1 of 7
Image 2 of 7 (Clous)
Image 3 of 7 (H.W.Necromancer)
Image 4 of 7 (jensma)
Image 5 of 7 (Clous)
Image 6 of 7 (jensma)
Image 7 of 7 (Clous)
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