Assembly question

[boriel]

The best way, IMHO, is to try to write your own routine in ZX Basic (in BASIC, yes).
UIsing POKE 16384 + Yourfunction(x, y) to calculate the screen address.
I did it in Sinclair BASIC years ago, and you will learn a lot doing it. :roll:

Update: This is what I did, If I recall correctly.

1. Poke 8 vertical lines with 255 (a black 8x8 square)
   
2. Like above but at any coord at (Y = 0, X = 0 .. 31)
   
3. Like the above but at any coord at (Y = 0..7, X = 0..31) < = This is first 3rd screen
   
4. Like the above but in any coord at (y = 8..15, x = 0, 31) <= This is the second screen "third"
   
5. Like the above but in any coord. You got it.
   
6. Add Attrs