Intensity_1F ($F29D)

Intensity_3F ($F2A1)

Intensity_5F ($F2A5)

Intensity_7F ($F2A9)

Intensity_a ($F2AB)

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.

ENTRY:

DP = $D0

A-reg = intensity (Intensity_a only)

EXIT:

D-reg trashed

Source