@cato This has triggered major nostalgia over here.
One of my earliest projects was an info screen in a Jeweller's window. (1984 at a guess).
I'm tempted to go and try and find the source code on 40 year old 3.5 inch floppies.
UCSD system pascal on an 8086 + z80 assembler on a custom display driver + 3 displays. The rest is a bit misty - although I think we snatched the fonts from the computer's VGA display and sent the bitmaps over serial to the z80 at boot time.