[time-nuts] FE-5680A Adjustment board

[Luca Pandolfini]

Hello,
This is my first post. :)
I found many old posts about the topic but to my knowledge none seems to
include this content, AFAIK.
I happen to have almost completed the majority of the reverse engineering
of the Temperature-controlled voltage "Adjustment Board" of an (old?)
FE-5680A (Since there are many different version, I am talking about the
exact model shown in this page:
http://www.dd1us.de/Downloads/precise%20reference%20frequency%20rev%201_1.pdf
).

If anybody is interested, I can share one or more of the following items:
- "pseudo-schematics" of the board,
- decompiled and (mostly) annotated microcontroller code
- description of the (full set? of) serial commands
- memory and EEPROM maps
- Temperature/Voltage calibration values

I started the project as a fun way to refresh my 8051 assembly skills and
play with useful tools while doing so (e.g. dumping the SPI EEPROM with a
BusPirate, dumping the PSD ROM with an Arduino, learning to use Ghidra,
etc...).
Since it might take quite a bit of time I just wanted to have feedback from
the community and know if it might be worth tidying up this material (but
only if there is some interest, since it looks like a device becoming
obsolete...).
Please let me know what you think and greetings to everybody!

LucaPandolfini