>>>LDIR? ;-)
>>>Fortran
>>
>>LOL, LDIR was a Z80 ASM block memory command. Old inside joke.
>
>Yup, one of those where that look like a word but a completely wrong one. BCPY or BTRN would be meaningful. Not a theoretical chance that I'd remember what abbreviates to LDIR.
>
>I once wrote my own printer driver for ZX... ok, copied what was there, and reworked it from ZX's thermal printer to Seikosha's 7-dot matrix printer. It even worked with COPY command - which was the best misnomer ever :). And it still fit into the 256 byte printer buffer.

[well, it's Sunday, I'll assume the permission to keep off-topic in most western countries]

Dragan, Load, Increment and Repeat, if I recall it correctly. My first work in computers: I was my brother's assembler (get his Z80 instructions, change them into binary form, and poke the bytes inside a REM in the first line of the ZX BASIC program). Convergently, I also wrote a dot-matrix printer and even get paid for that (a brand new Sinclair QL computer).

From those days, my favorite Z80 instruction: DJNZ (although hard to get it right at first - lots of resets because of this little bugger).

And a recommendation, for those machine coder programmers at heart: https://en.wikipedia.org/wiki/Human_Resource_Machine (interesting puzzles to solve by using a tiny assembly language).