Changes

Programming:Calculating xpos,ypos to screen address in assembly

7 bytes removed, 11:53, 25 December 2018

== Calculating xpos,ypos to screen address ==

The screen address at a given x,y position can be calculated as such:

~~[pre]~~

~~screenaddr = screenbase + (y AND 7)*&800 + int(y/8)*2*R1 + int(x/M)~~

[;; screenaddr = screenbase + (y AND 7)*&800 + int(y/~~pre]~~8)*2*R1 + int(x/M)

where:

2,912

edits