February 7th, 2013 ~ by admin

CPU of the Day: Unknown IBM MCM – Any ideas?

IBM MCM

Click for much larger

Every now and then I will get a chip in that I cannot ID.  This is a particularly perplexing one.  It looks like it should be something fairly well known, but I cannot determine what.  By the dates its a 2005 vintage IBM, MCM, on a fairly large ceramic package with 1077 lands.  It contains a pair of Infineon HYB39S256160DT-7 256Mbit (4Mbitx16bit) DRAMs which are 7ns 143MHz max, commonly used on PC133 SDRAM.   That works out to 64MB.  Also on the package is a IBM0436A8ACLAB 8Mbit (256Kx36) 4.5ns (222MHz) 1Mbyte SRAM.

IBM MCM die

IBM MCM die

Markings on the die are:
0FE45000L3
AKESXEX0
1 10-10
09K2262

 

If you have any ideas what it is, or what it may be, post a comment.  I may just give you one.  These came in with a lot of HP PA-RISC processors, so perhaps related?

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4 Responses to CPU of the Day: Unknown IBM MCM – Any ideas?

  1. Ian Farquhar

    Pure guess….

    One of their mainframe CPU’s from a departmental MF?

  2. admin

    I have no way to know, seems off since its such a substantial MCM

  3. techfury

    HP PA-8900. The 64MB of regular SDRAM as external cache is the giveaway.

  4. admin

    Removed from its module and with the heat spreader removed, never thought of that, of course it is a 8900.
    Thanks!

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