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Blackfury
Joined: 11 May 2006
Posts: 147
Location: DK
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 Posted: Wed Feb 21, 2007 9:59 am Post subject: Intel chip |
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Funde this chip today it has this nr on: P27256-25
u89116m
what is it?
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tlccomp
Joined: 11 May 2006
Posts: 1212
Location: Southeast Wisconsin, USA
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wepwawet
Joined: 18 Mar 2004
Posts: 3019
Location: Seligenstadt - Germany
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| Posted: Wed Feb 21, 2007 12:15 pm Post subject: |
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UV erasable chips need a window.
So this can be either a ROM, a PROM or an EEPROM. Not sure, but as this chip with a window would indeed be an EPROM i guess this is the electrical erasable version, the EEPROM with 265 k capacity
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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| Posted: Wed Feb 21, 2007 12:47 pm Post subject: |
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it IS a EPROM, and a UV EPROM at that.
however like tlc stated it is for production, and thus in a much cheaper plastic case, effectively making it a OTP part.
There has been some success erasing these with soft X-rays.
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wepwawet
Joined: 18 Mar 2004
Posts: 3019
Location: Seligenstadt - Germany
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| Posted: Wed Feb 21, 2007 1:27 pm Post subject: |
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incredible.
I've never realized that there are plastic EPROMs.
maybe I should have followed the link?!?
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