Difference between revisions of "OSWORD &09"

Revision as of 19:13, 8 March 2015

OSWORD &09 ( 9 ) - Read screen pixel value Acorn MOS 1.20

On entry:
 XY+0..1=X coordinate
 XY+2..3=Y coordinate
On exit:
 XY?4=pixel value, or &FF if the point was off screen or
  non-graphics screen mode.

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