To
set the display window starting position, write the value for
HSTARTinto
bits 0
through 7 and the value for VSTART into bits 8 through
15
of DIWSTRT.
Selecting
the
Stopping
Position
The
stopping position for the display window
is
the horizontal and vertical coordinates
of the lower right-hand corner of the display window. One register, DIWSTOP, contains
both coordinates, known as HSTOP and VSTOP.
See the notes in the "Forming a Basic Playfield" section for instructions on setting these
registers.
FULL
SCREEN
AREA
o
255
HSTOPof DISPLAY
WINDOW occurs in
this region.
361
Figure
3-21:
Display Window Horizontal Stopping Position
Select a value
that
represents the correct position
in
low-resolution, non-interlaced mode.
Playfield Hardware
71
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