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invasio
Joined: 11 Sep 2017
Posts: 558
Location: Hungary
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debs3759
Joined: 18 Jan 2006
Posts: 9477
Location: Northampton, Divided Kingdom
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 Posted: Mon May 16, 2022 10:02 am Post subject: |
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Without a screenshot, I'd be skeptical. I would want evidence that it's a BL3. Without a screenshot of a CPUID app, it could be one of several possible chips.
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My graphics card database can be found at http://www.gpuzoo.com.
I can resist anything except temptation.
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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misace
Joined: 14 Sep 2012
Posts: 932
Location: Prague, Czechia
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| Posted: Mon May 16, 2022 2:04 pm Post subject: |
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It looks like someone desoldered IBM 486BL3 from motherboard and soldered it on the adapter from AMD 386 DX PLCC chip.
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Looking For Chips 386 J38605DX, Symphony FPU, Rise Tiger, MP6-II, Winchip 3&4, IDT C6-Early Logo, Nx686, Tesla 8088, L80C86, Bulgarian 8088, Pentium 4 QT69ES. |
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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frag_
Joined: 17 Nov 2008
Posts: 4015
Location: Estonia
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| Posted: Mon May 16, 2022 3:13 pm Post subject: |
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BL3s are 3.3 but it's not a problem here, it has voltage converter on the back side (on the first photo).
There were commercial 386 upgrades with BL3, but they are usually have larger board, like this:
https://www.ardent-tool.com/CPU/386dx3+.jpg
https://www.ardent-tool.com/CPU/386dx3+_B.jpg
Oh wait, it's not an actual photo, actial device is much simpler and is unlikely can have BL3 without additional logic glue. |
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misace
Joined: 14 Sep 2012
Posts: 932
Location: Prague, Czechia
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| Posted: Mon May 16, 2022 3:27 pm Post subject: |
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There is no voltage regulator on actual item, only on example picture. Before I started collecting, I run 3.3V 486 chips at 5V, it did not destroy them even with overclocking.
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Looking For Chips 386 J38605DX, Symphony FPU, Rise Tiger, MP6-II, Winchip 3&4, IDT C6-Early Logo, Nx686, Tesla 8088, L80C86, Bulgarian 8088, Pentium 4 QT69ES. |
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black_monolith
Joined: 18 Mar 2007
Posts: 248
Location: Shandong, China
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| Posted: Mon May 16, 2022 8:04 pm Post subject: |
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I bet the CPU is not even rated for 100MHz. It's probably a -75 or -60 overclocked to 100.
I know IBM did announce a 100MHz part, but I am skeptical that it was actually produced. Ever BL chip I've ever seen was either a -60 or -75. Evergreen sold a 100MHz upgrade, but I've only ever seen those with heatsinks so they're likely overclocked. |
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feipoa
Joined: 08 Mar 2011
Posts: 553
Location: Canada
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| Posted: Fri Jun 03, 2022 4:17 pm Post subject: |
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I picked up the same Jaton AMD 386DX QFP-to-PGA from CPUshack and am considering soldering on a BL3-75 to see how well it works at 5V and 100 Mhz.
However, I know who bought the item in that eBay listing, so if my next AVICC ship date is later than the buyer's test date, I'll just let the buyer do all the work.
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The only thing I hate more than straightening CPU pins is having CPU's with bent pins in my collection. |
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invasio
Joined: 11 Sep 2017
Posts: 558
Location: Hungary
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| Posted: Thu Jun 09, 2022 4:21 am Post subject: |
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Is the buyer here with us?
I would love to see a benchmark ... |
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feipoa
Joined: 08 Mar 2011
Posts: 553
Location: Canada
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| Posted: Sun Jun 19, 2022 10:10 pm Post subject: |
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Here's some results using this hack job: https://www.vogons.org/viewtopic.php?p=1081111#p1081111
I guess the price of 386DX QFP to PGA adapters will go up slightly now.
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The only thing I hate more than straightening CPU pins is having CPU's with bent pins in my collection. |
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