Each of these routines are responsible for setting the vector/dot intensity (commonly used to denote the z axis) to a specific value. 0x00 is the lowest intensity, and 0x7F is the brightest intensity. A negative intensity is also lowest intensity (7th bit set). The intensity must be reset to the desired value after each call to Wait_Recal; however, it can also be changed at any other time. A copy of the new intensity value is saved in $C827.
DP = $D0
A-reg = intensity (Intensity_a only)