>>>>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.

For some values of "load", yes. Impossible to memorize.

> Convergently, I also wrote a dot-matrix printer and even get paid for that (a brand new Sinclair QL computer).

QL and early Macs, the machines I always wanted to have... Settled for an Atari STfM, much later.

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

Ah, that was a nice one.

>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).

I've seen some works in the 1k category, which means an .exe (or rather .com, less header) no longer than that, which even had 3d animation. The young whiz guys from the office were competing in that category. Amazing. There was even a 512 category.