6 ms·

All variants support 8 custom characters at least. I don't know if some nonstandard clones can do more. The 4x20 displays do not use two controllers. They are

• st_goliath 5y ago
  Interesting! I'm sorry if I'm a bit hazy on the details, but I was around 12 when I fiddled around with this stuff. Back then, I saved up some cash and bought a mail order AVR board with some LEDs, sensors on it plus an expansion board with an IIRC 2*16 LCD module on it and spent the summer copying assembly listings from ELV journal and some tutorial websites. I played around with a custom character set but never did anything as fancy as this. Although I did know that modules with 4 rows exist, those where pretty much Unobtanium for me at the time and I jumped at every forum thread that mentioned them, trying to find out how I could get my hands on one. IIRC I once saw a post on a German phpBB Forum (roboternetz.de? mosfetkiller.de?) with grainy pictures where somebody had such a module and couldn't get it to work. Someone else responded that those controllers only supports 2 rows with 20 characters maximum and modules with more characters or rows simply have 2 on them ("see, there are 2 black blobs on the rear..."). I remembered that from there. From my experience, I guess they won't be very happy if I dig up the ~20 year old thread and post a response now :-).