DFI 486-33/50UCE, 486DX2-50UCE
Form factor
Baby-AT (max 220 x 330mm)
PSU connector
AT-Style (P8-P9)
Chipset
Chipset parts
UMC UM82C481 UMC UM82C482 (any brand) 82C206
Dimensions
330mm x 220mm
CPU platform
486
Supported FSB speeds
25MHz, 33MHz, 50MHz
Cache
64 KB , 128 KB , 256 KB
Supported RAM size
32 MB
Supported RAM type
30-pin SIMM
I/O ports
1x 
AT Keyboard
Expansion slots
3x 
8-bit ISA
5x 
16-bit ISA

Known issues:

  • Leaky Ni-Cd clock battery.

    Remove the Ni-Cd battery as soon as possible and neutralize the leakage using white vinegar. Some more in-depth look may be needed to properly fix the motherboard. The battery can then be replaced using this https://github.com/wiretap-retro/Not-A-Varta.

Notes

486SX: J6 2-3; J7 open 486DX: J6 1-2, 3-4; J7 closed JP7 open (default) runs the system bus at 1:1 the oscillator. With it closed, it runs at 1:2 the oscillator (divided in half) so a 32MHz osc gives 16MHz, etc.

Last updated 2022-09-22T19:41:45Z
drv Drivers: not available
BIOS images: 3 files
Manuf.
POST String
Note
Core Ver.
BIOS Ver.
AMI
40-0100-ZZ1211-00101111-070791-U480A/2
070791
AMI
40-0100-ZZ1211-00101111-070791-UMC480A
070791
Mr. BIOS
1.65
doc Documentation: 1 entry
Model
Speed
FSB
Voltages
L1 Cache
L2 Cache
L3 Cache
Core
Process
TDP
Intel i486 DX 50
50MHz
50MHz
5V
8KB
-
-
P4
1000nm
-
Intel i486 DX2 66
66MHz
33MHz
5V
8KB
-
-
P24
800nm
5W
Intel i486 DX 33
33MHz
33MHz
5V
8KB
-
-
P4
1000nm
-
Intel i486 DX2 50
50MHz
25MHz
5V
8KB
-
-
P24
800nm
-
UMC U5S-SUPER33
33MHz
33MHz
5V
8KB
-
-
U5S
600nm
-
No NPUs listed.

Disclaimer

The info found in this page might not be entirely correct. Feel free to amend this page by logging in, contacting us on Discord or via email.