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HP / Agilent 34401A hidden menu

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coromonadalix:
hi
noob question,  is it the mainboard eeprom or the cpu eeprom

dimmog:

--- Quote from: coromonadalix on September 25, 2022, 12:43:33 am ---hi
noob question,  is it the mainboard eeprom or the cpu eeprom

--- End quote ---

This is U505 EEPROM IC.

dimmog:
Now I'm wondering if it's possible to make a DIAG:POKE command to activate those menus..

I found some info about DIAG:POKE.

tv84:

--- Quote from: Hydron on September 24, 2022, 11:57:35 pm ---Second try lucky (first try was turning on all the bits in the word which enabled the save menu) and it's the same byte as the DIAG:POKE 25,0,1 command changes - this time the high bit instead of the low bit. Word 0x08 (byte 0x10 in the endianness I'm using) is the one to tweak, along with the checksum of course.

--- End quote ---

I went to bed with the feeling that you would solve it very soon.  Great job! :clap: :clap:


--- Quote from: dimmog on September 25, 2022, 03:30:45 am ---Now I'm wondering if it's possible to make a DIAG:POKE command to activate those menus..

I found some info about DIAG:POKE.

--- End quote ---

I think so. Just a matter of processing all the knowledge gained in these last hours.

I think the cal string packing is an indicator of how all the binary structures are packed. The cal string is basically a concatenation of 7-bit chars (instead of the usual 8-bit). So, I've a feeling that all other structures are also tightly packed and don't obey to the usual byte boundaries.

Hydron:
dimmog, sadly I don't think the PEEK and POKE commands work like that on the 34401A, at least the ones which modify the eeprom. Though it might help to look at the post I linked earlier for some more examples.

Would be very useful to be able to turn the bits on via SCPI though, so not gonna discourage more testing!

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