Hello Robert,
I desoldered my EEPROMs and made the backup.
You can find the EEPROM dump attached to this email.
As a note my 8757C has 3 channels only.
I hope it helps to recover your machine.
Let me know if you need anything else.
73!
Razvan
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On 03/04/2024 14:22, YO4HFU via groups.io wrote:
Hello Razvan,
Thanks for reply. I will wait for your EEPROM files, if is possible.?I
don't expect to get the initial accuracy, but could find a compromise.
In meantime I identified the memory areas for each channel and "fixed"
by copy/paste from channel A (which is good) to B and R. I cleared the
warning for channel R but channel B has still active error.
So the problem is confirmed, corrupted EEPROM... No more ideas, I don't
know exactly bit functions, even here on group there are some vague
references about (ID, Checksum, etc)
HP8757E EEPROMs file found on KO4BB website already tested,
unfortunately are not compatible with C version.
73, Robert
