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H3nrik V!
Joined: 15 Apr 2014
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Location: Denmark
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 Posted: Fri May 10, 2019 12:37 am Post subject: i486DX-25 - why so rare? |
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What's actually the deal with the DX25's - they seem oddly rare compared to DX33's. Were they the first produced, and only 'till fabrication process and yield went up to make 33's? Enlighten me, please  |
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bccwchan
Joined: 20 Sep 2004
Posts: 2585
Location: Hong Kong
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| Posted: Sat May 11, 2019 6:13 pm Post subject: |
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| Most of my A80486DX-25 were made before 1991 week 28 so your guess is correct (early 486 production). |
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cuttingedgecs
Joined: 08 Oct 2017
Posts: 1764
Location: Australia
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| Posted: Sat May 11, 2019 8:14 pm Post subject: |
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| There wasn't a big market for them either. If you were on a budget you bought the SX-25, If you wanted performance you bought the SX or DX 33. There weren't many people who were prepared to pay the extra for the maths co-processor, but didn't also want the MHz jump to a 33. In standard tasks for the time an SX-33 outperformed a DX-25 but cost less. |
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H3nrik V!
Joined: 15 Apr 2014
Posts: 1246
Location: Denmark
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| Posted: Sun May 12, 2019 8:30 am Post subject: |
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Thanks for clarifying and confirming my theory. Sad, though, that they are so hard and expensive to come by now  |
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CHips
Joined: 01 May 2016
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Location: Switzerland
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| Posted: Sun May 12, 2019 8:44 am Post subject: |
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They are nowhere as rare as the A80386-12... You can easily find A80486DX-25s in Ebay or here occasionally...
Only some Sspecs are extremely rare like SX249 or SX250 (and I would trade my A80386-12 S40343 for an SX249 as well...)
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H3nrik V!
Joined: 15 Apr 2014
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Location: Denmark
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| Posted: Mon May 13, 2019 3:03 am Post subject: |
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| I expect that no DX-20 or DX-16's are made, either? |
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debs3759
Joined: 18 Jan 2006
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| Posted: Mon May 13, 2019 5:42 am Post subject: |
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| H3nrik V! wrote: | | I expect that no DX-20 or DX-16's are made, either? |
None that I have heard of, but there were SX-16 and SX-20
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H3nrik V!
Joined: 15 Apr 2014
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Location: Denmark
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| Posted: Mon May 13, 2019 6:04 am Post subject: |
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| debs3759 wrote: | | H3nrik V! wrote: | | I expect that no DX-20 or DX-16's are made, either? |
None that I have heard of, but there were SX-16 and SX-20 |
Yeah, I own an SX-20. The 16's are also horribly expensive |
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Neology
Joined: 25 May 2011
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xiaoyanxu
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H3nrik V!
Joined: 15 Apr 2014
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Location: Denmark
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| Posted: Sat Apr 25, 2020 2:53 am Post subject: |
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| Neology wrote: | | DX2-40 SX722 are also rare ones nowadays |
Tell me about it .. That's the only speed I don't own .. |
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Neology
Joined: 25 May 2011
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| Posted: Sat Apr 25, 2020 2:57 am Post subject: |
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| H3nrik V! wrote: | | Neology wrote: | | DX2-40 SX722 are also rare ones nowadays |
Tell me about it .. That's the only speed I don't own .. |
haha, for sure. This is the only ceramic sSpec of DX2-40
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H3nrik V!
Joined: 15 Apr 2014
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Location: Denmark
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| Posted: Sat Apr 25, 2020 8:18 am Post subject: |
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| Neology wrote: | | H3nrik V! wrote: | | Neology wrote: | | DX2-40 SX722 are also rare ones nowadays |
Tell me about it .. That's the only speed I don't own .. |
haha, for sure. This is the only ceramic sSpec of DX2-40 |
And probably not very widespread, even when new .. At a cribbling 20 MHz bus, it was probably not very popular compared to a DX33 .. As far as I understand, it was also mostly used for laptops? |
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Neology
Joined: 25 May 2011
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| Posted: Sat Apr 25, 2020 10:10 am Post subject: |
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| H3nrik V! wrote: | | Neology wrote: | | H3nrik V! wrote: | | Neology wrote: | | DX2-40 SX722 are also rare ones nowadays |
Tell me about it .. That's the only speed I don't own .. |
haha, for sure. This is the only ceramic sSpec of DX2-40 |
And probably not very widespread, even when new .. At a cribbling 20 MHz bus, it was probably not very popular compared to a DX33 .. As far as I understand, it was also mostly used for laptops? |
I think so, too. As most of the 40MHz are desoldered, it is used in laptop which don't have the luxury of space for a LIF or ZIF socket.
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Chook
Joined: 29 Oct 2008
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Location: Australia
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| Posted: Sun May 03, 2020 11:37 am Post subject: |
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From what I have read, in the day, a system based on a 486DX-25 was very expensive and not that fast. A good 386DX-40 system with more ram and a good hard drive was faster and a good deal cheaper. If you needed the extra power of the 486, the SX chip would do as most software of the day didn't need a co-pro. The 486SX-16 and SX-20 were almost completely pointless as any good late model 386 would outperform them.
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