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HP 54200A EPROM dumps needed

B

Big Andy

Jan 1, 1970
0
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
 
M

Mike Harrison

Jan 1, 1970
0
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.
 
B

Big Andy

Jan 1, 1970
0
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
 
J

Jim Flanagan

Jan 1, 1970
0
Andy -
I send you the binary images to your email address...
Good Luck.
Jim
 

Codebest

Jan 9, 2009
1
Joined
Jan 9, 2009
Messages
1
I suddenly find myself in the same situation with the same model of scope, ROM # 4 is getting a checksum error and some menus are missing from the interface. I don't suppose anyone would happen to still have these rom images around by any chance?

Thank you in advance.
 
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