3421A CAL RAM

[Dave Frederickson]

Thanks to MarkL over on EEVBlog Forum for confirming something I suspected.

All the bytes are offset by 0x40 to make them displayable characters.

Also, there's an undocumented command for the 3478, W(addr), for reading the CAL RAM data.

https://www.eevblog.com/forum/repair/hp-...msg1177119

Dave

Edit:

(04-02-2017 07:53 PM)J-F Garnier Wrote:  Observations:
all bytes are regular ASCII characters, which makes the manipulation of calibration data easier,
the characters are all in the range @-O that is 16 values: each calibration byte holds a 4-bit nibble,
there is no visible checksum.

Sorry, I didn't see this at first.