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80387 question

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First post, by LunarG

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This question is motivated by a most likely futile hope, but here goes:
I ordered an i80387sx on ebay. On the picture, they showed the "(16 - 25)" version, but the one I received is only marked as 16MHz.

Is there any hope in hell that this will work in my 386sx-20MHz?

Anyone happen to have LCC package 387sx 20 they'd want to trade for my 16MHz model?

WinXP : PIII 1.4GHz, 512MB RAM, 73GB SCSI HDD, Matrox Parhelia, SB Audigy 2.
Win98se : K6-3+ 500MHz, 256MB RAM, 80GB HDD, Matrox Millennium G400 MAX, Voodoo 2, SW1000XG.
DOS6.22 : Intel DX4, 64MB RAM, 1.6GB HDD, Diamond Stealth64 DRAM, GUS 1MB, SB16.

Reply 2 of 8, by LunarG

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konc wrote:

On the contrary, it has very good chances of working at 20MHz.

This is good news. We shall see when I get the other parts I need. Primarily my new RTC. Not installing any hardware until I get that.

WinXP : PIII 1.4GHz, 512MB RAM, 73GB SCSI HDD, Matrox Parhelia, SB Audigy 2.
Win98se : K6-3+ 500MHz, 256MB RAM, 80GB HDD, Matrox Millennium G400 MAX, Voodoo 2, SW1000XG.
DOS6.22 : Intel DX4, 64MB RAM, 1.6GB HDD, Diamond Stealth64 DRAM, GUS 1MB, SB16.

Reply 3 of 8, by Miphee

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Will this super cheap chinese 80387 work in this board with a 80386SX-16?

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Reply 4 of 8, by Grzyb

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Miphee wrote:

Will this super cheap chinese 80387 work in this board with a 80386SX-16?

Yes.
Even if you also receive a 16 MHz chip instead of the 16-25 MHz one, it will work with a 16 MHz CPU.

Żywotwór planetarny, jego gnijące błoto, jest świtem egzystencji, fazą wstępną, i wyłoni się z krwawych ciastomózgowych miedź miłująca...

Reply 7 of 8, by precaud

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derSammler wrote:

If that chip is actually a 387 at all. The imprint is completely fake.

That was my first reaction too. Put a drop of IPA on the bright white printing, I bet it will come right off.

Reply 8 of 8, by feltel

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I recently bought a bunch of those 387 PLCC chips. They do work quite well in my PS/2 56 which uses a 386SX @ 20 MHz. They are labeled as being 25 MHz parts. They were detected by the reference disk tools and also by a bunch of hardware diag tools I could test. I assume they are legit chips, probably originally at lower clock speeds.

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