Table of Contents
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UMC UM82C481
A 386DX/486 motherboard acquired from an auction, with information, repairs, testing and benchmarks.
Initial Thoughts
The UMC UM82C481 seems to be a design from the middle of the 386 era; it has a compact chipset, but not quite the 1-chip solution of the very last boards, it has 8x 30pin SIMM sockets, sockets for up to 256KBytes of cache
Original Auction Images
Motherboard Data & Variants
A summary of the motherboard capabilities follows:
Item | |
---|---|
Form Factor | |
Chipset | |
Dimensions | |
Maximum RAM | |
Cache | |
FPU | |
CPU Type | |
CPU Speeds | |
Expansion |
Motherboard jumper settings can be found in the following locations:
Configuration
0 Wait State & Further BIOS Optimisation
Math Co-Processor
Speed Testing & Tuning
Configuration 0
Results
Test | Config 0 |
---|---|
Processor Speed | MHz |
Wait states | 1 |
Norton Sysinfo CPU | |
Norton Sysinfo HDD | |
Norton Sysinfo Overall | |
CheckIt Dhrystones | |
CheckIt Whetstones | |
CheckIt Video chars/sec VGA 1 | |
CheckIt Video chars/sec VGA 2 | |
CheckIt HDD Transfer | |
Landmark CPU | |
Landmark FPU | |
Landmark Video VGA 1 | |
Landmark Video VGA 2 | |
3DBench VGA 1 | |
3DBench VGA 2 | |
ATPerf RAM Read | |
ATPerf RAM Write | |
ATPerf ROM Read | |
ATPerf Video Write VGA 1 | |
ATPerf Video Write VGA 2 | |
CompTest RAM thruput | |
CompTest Effective WS | |
CompTest MFLOPS | |
CompTest Video BIOS VGA 1 | |
CompTest Video BIOS VGA 2 | |
CompTest Video Direct VGA 1 | |
CompTest Video Direct VGA 2 | |
CompTest Dhrystones |
Games Results
In addition, the following game benchmark results were recorded:
Test | Config 0 |
---|---|
Wolfenstein 3D (FPS) | |
F1GP Bench 1 (CPU %) |
Software Versions
- Norton Sysinfo 8.0
- CheckIt 2.1
- Landmark 6.00
- 3DBench 1.0
- ATPerf 2.00
- Comptest 260
Notes
Conclusion
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