Atari 400

Atari Graphics & Sound 283
attempt to advance to the first column of the next row resulting
in Error 141 (Cursor Out of Range).
LOCATE moves
the cursor by altering the values stored in
memory address 84 (current cursor row number) and memory
addresses 85 and 86 (current cursor column number). The cursor
position change as a result of the execution of LOCATE will have
no effect on DRAWTO and XIO statements, as they use memory
addresses 90 , 91 , and 92 to determine the next cursor address.
PUT (Graphics)
The PUT statement can be used in the graphics modes to display
a
character or point. PUT uses the following configuration in
graphics.
PUT #6 , code
code
specifies a character in graphics modes ° through 2. In
graphics modes 3 through 8, code specifies a color register.
When PUT outputs data to the screen, memory addresses 84
(next cursor row number) and addresses 85 and 86 (next cursor
column number) are incremented. When a subsequent
statement that outputs data to the screen or sends data to it is
executed, the cursor will advance by one position .
PUT's updating of the next cursor addresses will not affect
subsequent DRAWTO or XIO statements as these use different
cursor position memory addresses (90 , 91, and 92).
If PUT is executed with the cursor in the last column of a row, the
cursor will attempt to advance to the first position of the next
row . If this occurs, error 141 (Cursor Out of Range) may appear.
XIO (Graphics)
XIO is used in graphics to fill an area of the screen. XIO uses the
following configuration .
XIO command , channel #, numexpl, numexp 2, device