Entry
R0 = base (10=decimal)
R2 = window handle
R3 = icon handle
R4 = maximum value
R5 = step
Exit
R0 = new value
Converts the string in the icon to an signed integer, adds the step, and puts it back. Updates the screen as necessary. The value will not go beyond the value passed in R4, and the new value is returned in R0.
Provided by Icons
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