Uploaded May 2025 | Updated September 2026, 1 week ago
A few weeks ago at the System Source Swap Meet, I bought two computers from the Museum Sale. Both needed some work.
I've now done that work, save for the floppy drives, and it's time to put the computers back together. My basement will thank me, as assembled computers take less room than disassembled computers. We'll even try to image the SCSI drive that was in one of the computers using a Blue SCSI v2.
Will we get both computers back together? Will the cache upgrade work? Will we successfully image the SCSI drive? You'll have to watch to find out!
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A few weeks ago at the System Source Swap Meet, I bought two computers from the Museum Sale. Both needed some work.
I've now done that work, save for the floppy drives, and it's time to put the computers back together. My basement will thank me, as assembled computers take less room than disassembled computers. We'll even try to image the SCSI drive that was in one of the computers using a Blue SCSI v2.
Will we get both computers back together? Will the cache upgrade work? Will we successfully image the SCSI drive? You'll have to watch to find out!
*
Use discount code JUSTINTIME for for 5% off all Computerized Start™ merchandise at https://shop.jdmcs.com.
*
Ways to Support the Channel:
☕️ Tips or Support via Ko-fi: ko-fi.com/jdmcs
🈷️ Support me on Patreon: patreon.com/jdmcs
📦 Amazon Wishlist: jdmcs.net/wishlist
... or simply do the YouTube things: Like/Dislike, Comment, Subscribe, Enable Notifications, and participate in the Chat. These things help the channel, too!
**
Read Computerized Start™, my Official Blog: jdmcs.net/myblog
Follow me on Instagram: jdmcs.net/myinstagram
Follow me on Twitter: jdmcs.net/mytwitter
![My UMC U5SX 486-33F: Does Windows 98SE Detect It as a Pentium MMX? (Computerized Start™ Live)
Youve probably heard of Intel and AMD processors, as both manufacturers are still in business today. If youve been into computing long enough, youve probably also heard of Cyrix. All three companies made 486 processors for Socket 1-3 systems.
But did you know that UMC also made 486 processors? No? That partly might be because Intel sued patent infringement, and as a result of the settlement of the case, UMC had to withdraw their processors from the US market. That might also be because they only made 486SX-era processors, not leaving a huge window for sales in other markets; Wikipedia mentions that they did have a clock-doubled version in production, but only engineering samples existed.
Speaking of Wikipedia, someone has added a claim with no footnote or citation:
Due to an error in the microcode, Microsoft Windows 98 Second Edition identifies some processors as an Intel Pentium MMX which could cause the operating system and software running within it to crash or exhibit undefined behavior.
(https://en.wikipedia.org/wiki/UMC_Green_CPU, accessed December 30, 2025)
To which I have to say, [citation needed].
Since I now have a UMC Green CPU, specifically the UMC U5SX 486-33F, I can actually try to put this to the test... or all the Windows installs will put me to the test! We got Windows 95 and Windows 98 First Edition, then had trouble getting Windows 98 Second Edition installed.
Tonight, Im going to try to get Windows 98SE installed, but by doing a fresh install instead of an update.
Will Windows 98SE detect my UMC 486 as a Pentium MMX? Or will I have trouble installing Windows 98SE on this unsupported system configuration? Youll have to watch to find out!
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☕️ Tips or Support via Ko-fi: https://ko-fi.com/jdmcs
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... or simply do the YouTube things: Like/Dislike, Comment, Subscribe, Enable Notifications, and participate in the Chat. These things help the channel, too!
**
Read Computerized Start™, my Official Blog: https://jdmcs.net/myblog
Follow me on Instagram: https://jdmcs.net/myinstagram
Follow me on Twitter: https://jdmcs.net/mytwitter My UMC U5SX 486-33F: Does Windows 98SE Detect It as a Pentium MMX? (Computerized Start™ Live)](https://i.ytimg.com/vi/SsPsjlIT-Q4/mqdefault.jpg)









