HP 54200A EPROM dumps needed

[Jim Flanagan]

Andy -
I send you the binary images to your email address...
Good Luck.
Jim

 

[Big Andy]

I gave it a try and went down to Vcc=3.8V step by step. Between 4V and
5V read checksum is stable, below 4.0V I get random checksums. I think
I won't be able to recover the data from the old EPROMs...

Thank you Mike and best regards,
Andy

 

[Mike Harrison]

On Fri, 15 Feb 2008 14:44:20 -0800 (PST), Big Andy <bigandy@go4more.de> wrote:

Hi all,

my HP 54200A left me. It dumps lots of &&&&& on the screen, no beep,
no keyboard actions, no obvious hardware damage.

I suppose that the contents of the EPROMs have partially disappeared
after 23 yrs. Lots of FFs between binary and text code, quite unusual
for expensive EPROMs anyway.

Does anybody own a functional 54200A and is willing to read those
EPROMs and mail me the content?

Any help is much appreciated.

Thanks,

Andy

If you have a universal programmer, it may be worth trying to read them with a lower Vcc - if bits
are marginal, this may be enough to get the data out.

 

[Big Andy]

Hi all,

my HP 54200A left me. It dumps lots of &&&&& on the screen, no beep,
no keyboard actions, no obvious hardware damage.

I suppose that the contents of the EPROMs have partially disappeared
after 23 yrs. Lots of FFs between binary and text code, quite unusual
for expensive EPROMs anyway.

Does anybody own a functional 54200A and is willing to read those
EPROMs and mail me the content?

Any help is much appreciated.

Thanks,

Andy