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486 CPU Heatsink Removal and Identification Am486

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First post, by whitepawn

Posted on 
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I Recently bought 3 486 cpus from local scrapyard which can be seen below:

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I have 3 questions about them:

1)One of them (Left one) is glued to heatsink as seen with some kind of epoxy i believe.Is it possible to remove heatsink from CPU without damaging ceramic package?The reason i want to remove heatsink from CPU is to identify CPU type voltage frequency and so on to test it.Backside of CPU has no identifications except some sticker.
Are there any methods without physically stressing ceramic package?I have tried isoprophyl alcohol between heatsink and ceramic to soften glue but no luck.Any tips?

2)One of them (Middle one) has erased markings.How can i dentify this CPU?Also backside has no markings except some sticker.

3)Am486 DE2-66V8TGC seems like normal Am486 DX2 with power management feature.Can i set motherboard jumpers according to DX2?Will it work same as DX2?

Thanks in advance!

Reply 1 of 2, by Deksor

Posted on 
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l33t

The middle chip has "25398" marking. It can be anything between a DX2-66 and a DX4-120, however the voltage seems to be 3.3V. You should be able to try it at different speeds (with 3.3V)

Actually you should be able to do the same with the other chip with a heatsink. Plug it in the motherboard with 3.3V set with 2x multiplier and 33MHz clock.
Does it work ? Yes : 3.3V chip
No : 5V chip

Does it work at 3x mutliplier ? Yes : it's a DX4
No : it's a DX2

For the FSB, it's harder to tell, because they can usually run stable overclocked ... which also means it probably doesn't matter.

Trying to identify old hardware ? Visit The retro web - Project's thread The Retro Web project - a stason.org/TH99 alternative

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