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mikewolak
Joined: 19 Jan 2010
Posts: 19
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 Posted: Thu Feb 04, 2010 8:48 pm Post subject: Strange Mostek Chips - 28-Pin white CDIP package |
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I was sorting through some ICs I picked up awhile back and came across these two. I can't really tell what the model # is , I'm guessing it's MK2004P and MK2003P.
Datecodes: 73/14, 73/18
Is this old memory?
Any idea why they drilled holes in the package?
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donutty
Joined: 16 Feb 2008
Posts: 1122
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| Posted: Fri Feb 05, 2010 4:13 am Post subject: |
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A lot of older packages have those holes. Don't know why... maybe for automatic handling equipment?
Mostek made a lot of custom chips like that, so you might not ever get to find out what they are  |
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wepwawet
Joined: 18 Mar 2004
Posts: 3019
Location: Seligenstadt - Germany
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| Posted: Fri Feb 05, 2010 10:45 am Post subject: |
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my first guess, a calculator chip, maybe from an old hp?
search hpmuseum.org and go to the technologies and packages pages, there are many highres-pictures.
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mikewolak
Joined: 19 Jan 2010
Posts: 19
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| Posted: Fri Feb 05, 2010 3:29 pm Post subject: |
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Thanks wepwawet, I had a look at the HP calc site but didn't find anything. It seems all the calculator chips start with MK5xxx , nothing with MK2xxx unfortunately. I'll just stick them in the "unknown" box with the rest of the odd-balls  |
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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mikewolak
Joined: 19 Jan 2010
Posts: 19
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| Posted: Fri Feb 05, 2010 7:14 pm Post subject: |
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| CPUShack wrote: | | MK2xxx chips are ROMS |
Thank you for that information. |
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