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ph4nt0m
Joined: 01 Jan 2018
Posts: 812
Location: Europe
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 Posted: Tue Oct 31, 2023 11:35 am Post subject: ph4nt0m: Texas Instruments 486SXL2 66MHz |
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These are basically 386 CPUs with some 486 instructions and 8Kb cache added. Very much like boosted Cyrix 486DLC.
TI486SXL2-G66-GA
486 PGA168 pin-out
Year 1995 week 5
Compatible with early 486 mainboards that support 386 style system bus. Probably OPTi or UMC based.
New old stock
$25 each
Some are at the AVICC, those go straight to your box. Some are in Europe, sending at cost, $10 to $15 worldwide.
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dennydo
Joined: 22 Feb 2021
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Location: Luxembourg
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invasio
Joined: 11 Sep 2017
Posts: 558
Location: Hungary
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| Posted: Tue Oct 31, 2023 2:51 pm Post subject: |
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| I’ll take one, too. |
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stamasd
Joined: 05 Jun 2014
Posts: 1311
Location: Connecticut
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| Posted: Tue Oct 31, 2023 3:41 pm Post subject: |
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| Careful with these, they are not 5V parts. Yes the I/O is 5V-tolerant but they still need 3.6V supply for the core. Don't just plug them into any motherboard. |
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ph4nt0m
Joined: 01 Jan 2018
Posts: 812
Location: Europe
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| Posted: Tue Oct 31, 2023 3:47 pm Post subject: |
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| stamasd wrote: | | Careful with these, they are not 5V parts. Yes the I/O is 5V-tolerant but they still need 3.6V supply for the core. Don't just plug them into any motherboard. |
There are many 486 interposers with voltage conversion to choose from. Anyway, I don't think they will burn out on 5V. Active cooling should help.
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c3h5
Joined: 28 Aug 2017
Posts: 57
Location: New Hampshire, USA
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| Posted: Tue Oct 31, 2023 8:14 pm Post subject: |
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| I’ll take one |
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ThaManWithTheHat
Joined: 03 Jun 2023
Posts: 1
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| Posted: Tue Nov 07, 2023 7:43 am Post subject: |
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| I’ll take one. |
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vmr_
Joined: 01 Sep 2018
Posts: 530
Location: Ireland
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| Posted: Tue Nov 07, 2023 11:16 am Post subject: |
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update: no CPU for me, as John already added one in my box 
thanks |
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feipoa
Joined: 08 Mar 2011
Posts: 553
Location: Canada
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| Posted: Fri Nov 10, 2023 5:17 am Post subject: |
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ph4nt0m, did you buy so many for the purpose of binning? If so, how fast did you get one running and at what voltage?
Most will do 80 MHz at 4.x volts. I have one that can do 90 MHz, but it needs 5 V.
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ph4nt0m
Joined: 01 Jan 2018
Posts: 812
Location: Europe
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| Posted: Fri Nov 10, 2023 6:46 am Post subject: |
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| feipoa wrote: | ph4nt0m, did you buy so many for the purpose of binning? If so, how fast did you get one running and at what voltage?
Most will do 80 MHz at 4.x volts. I have one that can do 90 MHz, but it needs 5 V. |
Yep, that's the plan. Although I have postponed this task because there are more pressing matters requiring my attention. Anyway, I have got way more of these than pictured, so it will be a fun ride. My only concern is that a PGA socket isn't going to survive through so many insertions and removals, so I probably have to upgrade it to a ZIF socket first.
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feipoa
Joined: 08 Mar 2011
Posts: 553
Location: Canada
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| Posted: Fri Nov 10, 2023 6:54 am Post subject: |
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Our of curiosity, how many are you binning? It took me 13 CPUs to get just one that could do 90 MHz reliably.
Let me know if you find a cheap source for NOS socket 3 ZIFs.
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ph4nt0m
Joined: 01 Jan 2018
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| Posted: Fri Nov 10, 2023 8:55 am Post subject: |
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Half a hundred, give or take.
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feipoa
Joined: 08 Mar 2011
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| Posted: Fri Nov 10, 2023 5:01 pm Post subject: |
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Please keep me apprised of the results. If you can reach 90 MHz at less than 4.95 V, or even 100 MHz without refrigeration, there is great promise for this chip.
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ph4nt0m
Joined: 01 Jan 2018
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Location: Europe
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| Posted: Fri Nov 10, 2023 5:46 pm Post subject: |
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It would be interesting to design a 486-to-386 adaptor with voltage conversion for this CPU, but the PGA parts required are hard to come by these days.
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debs3759
Joined: 18 Jan 2006
Posts: 9477
Location: Northampton, Divided Kingdom
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| Posted: Fri Nov 10, 2023 6:05 pm Post subject: |
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Some members in Vogons are working on an interposer so these can be run on a regular 486 board. Supposedly, these have a different pin-out to other 486 CPUs. This is the first time I've read that they will run on early 486 boards, and with them being 3.6V parts, I'm surprised.
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