X<> d is a synthetic function alright, and no, the 42S and Free42/DM42 do not support these.
In this case, you may use the RCLFLAG and STOFLAG functions instead, though not in the same way.. there's no X<>FLAG functionality - the 42S has more flags than fit in a single register.
See https://thomasokken.com/free42/#extensions for an overview of all Free42 extensions (the string ones are not yet in the DM42)
Cheers, Werner
Thanks - and yes, I also concluded, that since my Free42 couldn't, then the DM42 wouldnøt either.
No big deal, just some old programs that I wanted to enter for nostalgic reasons
/Rudi
DM-42 (s/n 06999), HP-42S, HP-35s, HP-11c, HP-32SII (ex HP-41CV, ex HP-75C, ex HP-48G + a lot, really lot of a accessories)
Denmark