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ATARI Light Pen Operator's Manual
APPENDIX D - PENBUF FLOW CHART
APPENDIX D—PENBUF FLOW CHART
START
/ READ
/ PEN
/ HORZ.
REGISTER/
/ READ
/ PEN
/ VERT.
'register/
NO
YES
/^looped\
CORRECT
NUMBER OF
TIMES YET
CONVERT X, Y
TO COL, POW FOR
MODE 0 USE
CONVERT
TOX.
MOVE CENTER
VALUES TO
206,207
WAIT UNTIL
NEXT FRAME
INITIALIZE
POINTERS
AND COUNTERS
CONVERT
TOY
SORT ON
X TABLE
END
Figure D. 1
PENBUF Flow Chart
PENBUF Flow Chart - 53
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