Programming instructions

The instructions are:
dsf - 700501 - Skip if the Display flag is a 1. The Display Flag is set to 1
when the Light Pen senses light.
dcf - 700601 - Clear the Display flag.
dxl - 700506 - Load the C(XB) with C(ACx.,i).
dyl - 700606 - Load the C(YB) with C(ACX.17).
dxs - 700546 - Load the C(XB) with C(ACX-17). Plot the point: C(XB), C(YB).
dys - 700646 - Load the C(YB) with C(ACx-li). Plot the point: C(XB), C(YB).
dlb - 700706 - Load the Brightness Register with AC bits 15-17. The bits of
AC specify the brightness of the points displayed. Clear the
Display flag.
700502 - Clear XB.
700504 - C(SB) V C(AC) => C(XB). Display a point.
700602 - Clear YB.
700604 - C(YB) V C(AC) => C(YB). Display a point.
X or Y Coordinate
and lntensitv
PRECISION CRT
DISPLAY CONTROL,
TYPE 30D
Status Bits: None
Program Interrupt: None
Figure 12 - Precision CRT Display, Type 30D, and Light Pen, Type 32
33