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HP-85 ROM internals picture? - Printable Version

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HP-85 ROM internals picture? - 1980s_john - 02-28-2017 09:51 PM

Hi,

Has anyone got a picture please of the inside of an HP-85 ROM? I recall they look like a blob of epoxy with wires coming out, but Google can't find an image.

Thanks,
John


RE: HP-85 ROM internals picture? - Paul Berger (Canada) - 02-28-2017 10:49 PM

There are no visible wires it is just a blob of epoxy on a small printed circuit board with plated through holes along the long edges that provide connection to the ROM drawer. Under the epoxy blob the die is likely wire-bonded directly to the circuit board.


RE: HP-85 ROM internals picture? - Martin Hepperle - 03-01-2017 10:06 PM

... look here https://groups.io/g/hpseries80/album?id=642
Martin


RE: HP-85 ROM internals picture? - 1980s_john - 03-01-2017 10:22 PM

Thanks Martin!

Regards,
John


RE: HP-85 ROM internals picture? - Garth Wilson - 03-02-2017 05:04 AM

The link requires an account and login.


RE: HP-85 ROM internals picture? - Martin Hepperle - 03-02-2017 09:21 PM

(03-02-2017 05:04 AM)Garth Wilson Wrote:  The link requires an account and login.

Ah, yes - I have attached one reduced scale version of one of my images.
If you are interested in Series-80 computers you should join this group (in addition to this Forum) because it specializes on the Series-80 systems. No big overlap with the more calculator-centric business going on here.
Martin