HP 9872 Refurbishment

Eric Smith spacewar at gmail.com
Mon Dec 5 18:57:31 CST 2016

On Mon, Dec 5, 2016 at 11:20 AM, Craig Ruff <cruff at ruffspot.net> wrote:

> Also, since I have it apart, I thought it might be good to image the
> firmware ROM set.  They are marked Mostek MK36647N-5 and MK36648N-5, along
> with the HP part numbers.  From the schematic, they appear to be 5V 8KB
> ROMs, so nothing fancy should be required to read the contents.  It appears
> these might be MK36000N-5 mask programmed ROMs?

Yes. And same for the 9872T.

The 9872A uses HP ROMs that aren't compatible with anything else. I'm not
sure about the 9872B and 9872S.

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