+ AA6YQ comments below
I do understand that FT857 CAT has LIMITED sets of commands.
I have run into "external CAT display" hardware.
IMHO - for using tiny iPhone display it seems overpriced.
What interests me - I noticed "scan ' display on one of the pictures.
Looks as not a "standard" CAT command, but I may be wrong.
So the question of the day - did anybody actually reverse engineered the factory standard
CAT commands and in the process
"discovered" some of not published commands?
+ Yes, years ago. Many of the undocumented commands involve writing to the transceiver's EEPROM, which has a fixed write budget. The exhaustion of this write budget by applications that exploit these undocumented commands coupled with the unavailability of replacement EEPROMs has evidently resulted in the premature retirement of several FT-817s, and a "stop doing that!" warning from Yaesu.
73,
Dave, AA6YQ