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H3nrik V!
Joined: 15 Apr 2014
Posts: 1246
Location: Denmark
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 Posted: Mon Feb 15, 2016 2:37 pm Post subject: Intel 486 Codenames? |
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I'm trying to gather some info regarding the 486s from Intel. I seem to come short regarding the chip/die codenames, as different sources don't seem to be 100% aligned. Here's what I think I can pretty much say for sure:
P4: 486DX
P4S: 486DX-S (That's SL i.e. "LOWPOWER" and "&E"?)
P24: 486DX2
P24S: 486DX2-S (That's SL i.e. "LOWPOWER" and "&E"?)
P24D: 486DX2 WriteBack
P24C: 486DX4 (WriteThrough, I guess?)
P23: 486SX
P23S: 486SX-S (That's SL i.e. "LOWPOWER" and "&E"?)
P24T: Pentium overdrive
What I am really not sure about is:
P4T: a 486 overdrive?
P23T: also 486 overdrive?
In case both are 486 ODs, what is the difference? Is it whether they are intended for a DX or SX system, or is it whether they are ODP or ODPR og are they different generations?
P24LM: Maybe a DX2 in a low voltage version?
Furthermore: Where does the 487sx and the 486SX2 fit in, and what about the DX4 in WriteBack version? |
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crusty_dog
Joined: 03 Apr 2015
Posts: 103
Location: Australia / Singapore
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| Posted: Mon Feb 15, 2016 6:24 pm Post subject: |
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from memory & quick check through work notes
P4 - Intel i486DX
P4S - Intel i486DX SL Enhanced
P24 - Intel i486DX2
P24S - Intel i486DX2 SL Enhanced
P24D - Intel i486DX2 Write Back Enhanced
P24C - Intel intelDX4, 3.45V
P23 - Intel i486SX
P23S - Intel i486SX SL Enhanced
P4T - Intel i486 Overdrive (ODPR)
P23T - Intel i486 Overdrive (ODP)
P23N - Intel i487SX
P24T - Intel i486DX4 Overdrive, 5V
P24CT - Intel Pentium OverDrive, 3.3V
will check my other work notes later & see if I can find more info
Last edited by crusty_dog on Tue Feb 16, 2016 7:43 am; edited 1 time in total |
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H3nrik V!
Joined: 15 Apr 2014
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Location: Denmark
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| Posted: Tue Feb 16, 2016 1:39 am Post subject: |
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Thanks, that cleared up some of it and added the 487. But still - does the P24C cover both the "normal" and the writeback enhanced DX4? And I still have doubts about the overdrive P4T/P23T, since the info I can find about them is not consistent.
I'm not sure, what you mean by "no production parts" on the P24T? |
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CPUShack
Joined: 16 Jun 2003
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Location: State of Jefferson, USA
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crusty_dog
Joined: 03 Apr 2015
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Location: Australia / Singapore
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| Posted: Tue Feb 16, 2016 3:31 am Post subject: |
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| H3nrik V! wrote: | | I'm not sure, what you mean by "no production parts" on the P24T? |
Sorry.. transcribe the info across incorrectly
P24T are 63 & 83MHz Pentium ODs the core ran on 3.3 - 3.5V
P24CT are 5V DX4 486 Overdrives
Had a look online and I agree there is a lot of confusion
I will check through my notes on the weekend & confirm the info I have give is correct
This may be on interest to you
http://www.lenovo.com/psref/pdf/tecwbook.pdf |
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Chook
Joined: 29 Oct 2008
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| Posted: Tue Feb 16, 2016 7:48 am Post subject: |
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P24CT was the one that had no production parts. It would have been a Pentium Overdrive that would only work in Socket 3 motherboards with 3.3V, not the older Socket 2 and 1 with 5V.
Only a dummy mechanical sample is known.
http://www.cpu-world.com/forum/viewtopic.php?t=16906&highlight=p24ct
This chip would probably kept the 486 going for a few more years had it been made. Might have been released at 100Mhz. Intel probably didn't want it to compete with the socket 5 Pentiums.
_________________
General failure reading disk in drive A
Who's General Failure and why is he reading my disk? |
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H3nrik V!
Joined: 15 Apr 2014
Posts: 1246
Location: Denmark
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| Posted: Tue Feb 16, 2016 11:55 am Post subject: |
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| Chook wrote: | P24CT was the one that had no production parts. It would have been a Pentium Overdrive that would only work in Socket 3 motherboards with 3.3V, not the older Socket 2 and 1 with 5V.
Only a dummy mechanical sample is known.
http://www.cpu-world.com/forum/viewtopic.php?t=16906&highlight=p24ct
This chip would probably kept the 486 going for a few more years had it been made. Might have been released at 100Mhz. Intel probably didn't want it to compete with the socket 5 Pentiums. |
That kind of makes sense, thanks.
BTW, what is the codename for the DX3?    |
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H3nrik V!
Joined: 15 Apr 2014
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Location: Denmark
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| Posted: Tue Feb 16, 2016 11:57 am Post subject: |
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From this:
http://www.x86-guide.com/en/cpu/Intel-486.html
It seems that P23T are considered the SX-series OD's and the P4T are the DX/DX2. But also, there are DX4 overdrives, that seems to have 16K of L1 cache? What core/diecode are they? |
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H3nrik V!
Joined: 15 Apr 2014
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Location: Denmark
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| Posted: Tue Feb 16, 2016 11:58 am Post subject: |
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| crusty_dog wrote: | | H3nrik V! wrote: | | I'm not sure, what you mean by "no production parts" on the P24T? |
Sorry.. transcribe the info across incorrectly
P24T are 63 & 83MHz Pentium ODs the core ran on 3.3 - 3.5V
P24CT are 5V DX4 486 Overdrives
Had a look online and I agree there is a lot of confusion
I will check through my notes on the weekend & confirm the info I have give is correct
This may be on interest to you
http://www.lenovo.com/psref/pdf/tecwbook.pdf |
Thanks, that's also an interesting document.
EDIT; But some differences to what I read elsewhere: the P24D is a DX4 WB according to this? Other sources says P24D is DX2 WB.
Looking forward to see what your notes will show!  |
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H3nrik V!
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CPUShack
Joined: 16 Jun 2003
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