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Qwerty
Joined: 20 May 2005
Posts: 3141
Location: Germany
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 Posted: Thu Sep 21, 2006 4:05 pm Post subject: Strange TI CPU |
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Hi everyone !
I've got this quite unusual TI 486SXL2-50
There is a small board mounted on the CPU. What is it ?
This CPU seems to be rare. I browsed about ten collector's sites but I found only one picture at cpu-world. But that 486SXL2-50 don't have the board on it.
Does someone have a similar CPU with a board ? |
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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JAC
Joined: 24 Jul 2005
Posts: 3469
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| Posted: Thu Sep 21, 2006 4:09 pm Post subject: |
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74HC4024D is a binary ripple counter
74VHC00 is a nand gate
Looks like a 6Mhz crystal with two stabilisation caps...
to me it looks like a external clock modification. 6Mhz divided down by the counter. Very interesting.
There is also a very large die cover.. strange chip. |
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Mixeur
Joined: 06 Jan 2005
Posts: 4038
Location: Sochaux, France
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chip68
Joined: 19 Oct 2004
Posts: 1024
Location: Central Pennsylvania
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| Posted: Thu Sep 21, 2006 6:15 pm Post subject: Re: Strange TI CPU |
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| Qwerty wrote: | | There is a small board mounted on the CPU. What is it ? |
That would be called a "kludge." 
- CMW |
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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Qwerty
Joined: 20 May 2005
Posts: 3141
Location: Germany
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| Posted: Fri Sep 22, 2006 5:17 am Post subject: |
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Thanks for information !
And what does "SX" in "SXL2" mean ?
Is this CPU a upgrade to PGA 386SX board or is it a 486 without FPU ?
| JAC wrote: |
There is also a very large die cover.. strange chip. |
My TI 486SXL2-50 has a 386 pinout - 132-pin PGA - that's why the die cover appears so large.
I didn't realize this earlier, but it seems to exist two different TI 486SXL2-50 versoins - one with 132-pin PGA package for 386 and one with 168-pin PGA for 486 boards !
The 486SXL2-50 on Genna's page is described as 168-pin PGA
http://www.cpu-world.com/CPUs/80486/MANUF-Texas%20Instruments.html
I have also found this picture of 168-pin version
http://www.pc-atrium.de/Zu_den_CPUs/TI/TI80486/ti80486.html
And here are both versions together: http://www.cpu-cn.com/EN/Mfg.asp
(and then click "Texas Instruments" link) |
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debs3759
Joined: 18 Jan 2006
Posts: 9477
Location: Northampton, Divided Kingdom
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| Posted: Mon Sep 25, 2006 8:04 am Post subject: |
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I have the version pictures at the top of the page. It was sold by Improve Technologies under the brand "Make-IT 486" and was sold as an upgrade for a 386 system. They also had a version (not sure if that was also a 486SXL as my box only contained the PGA version) that clipped on to a SMD 386 to upgrade that, and based on the box I have they should have both been in the same box. Within a couple of weeks I hope to have my next MAJOR update uploaded to my web site, and that will include scans of this chip plus the box it came in.
_________________
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Sten
Joined: 04 Feb 2006
Posts: 358
Location: Czech Republic
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| Posted: Sun Oct 08, 2006 10:53 am Post subject: My version of TI 486SXLC2 50Mhz |
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Hi all
That`s mine version of TI 486 SXLC2 50Mhz, but this one is FPU. Any idea if FSB of this chip runs at 50Mhz or 2x25Mhz? is it 16 or 32bit chip?
Please advise
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spongiforme
Joined: 02 Aug 2006
Posts: 168
Location: Montpellier, France
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| Posted: Sun Oct 08, 2006 11:13 am Post subject: |
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Long, long ago I had a nice HP machine sporting a 386SX-20. At some point I upgraded it using a Cyrix/Evergreen CPU module that would clip on top of the 386SX and replace it. The CPU has a whopping 1 KB of cache Perhaps is this the same class of chip?
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debs3759
Joined: 18 Jan 2006
Posts: 9477
Location: Northampton, Divided Kingdom
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| Posted: Mon Oct 09, 2006 7:08 am Post subject: |
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I'm not sure where I got the original info from (all my info is at home, I'm not, but I have my website with me ready to upload at another library later...), but the info I have on my TI 386 page is:
TI486SXL has 8K unified, write—through L1 cache
TI486SXL2 has 8K unified, write—through L1 cache
TI486SXLC2 has 1K unified, write—through L1 cache
The SXL2 is the one contained in the box below
_________________
My graphics card database can be found at http://www.gpuzoo.com.
I can resist anything except temptation.
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JAC
Joined: 24 Jul 2005
Posts: 3469
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| Posted: Mon Oct 09, 2006 7:09 am Post subject: |
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oh.. nice info.. I like the "ultimate upgrade"  |
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debs3759
Joined: 18 Jan 2006
Posts: 9477
Location: Northampton, Divided Kingdom
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| Posted: Mon Oct 09, 2006 7:12 am Post subject: |
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LOL, yeah it's an upgrade you'll never want to do without
_________________
My graphics card database can be found at http://www.gpuzoo.com.
I can resist anything except temptation.
Debs |
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JAC
Joined: 24 Jul 2005
Posts: 3469
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| Posted: Mon Oct 09, 2006 7:17 am Post subject: |
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".. fast and simple you can do in just minutes"
Must be Martian minutes. I dont remember anything taking "just minutes" with old pc's  |
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Mixeur
Joined: 06 Jan 2005
Posts: 4038
Location: Sochaux, France
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| Posted: Sun Nov 19, 2006 7:22 am Post subject: |
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TI486SXLC2 has 8K L1 cache too.
Afak, SXLC are only available on QFP package, and I think this is the only difference with SXL2 (which is only available in PGA)
It seems that both PGA132 and PGA168 TI486 are based on the same core, made by TI (different from Cyrix one) and called "Potomac".
It is the TI486SLC that has only 1K L1 cache.
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