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Programming:Calculating xpos,ypos to screen address in assembly

9 bytes added, 11:53, 25 December 2018
 == Calculating xpos,ypos to screen address in assembly ==
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:
screenbase = &C000
 
 
 
[[Category:Programming]]
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