Draw_Pat_VL_a ($F434)
This routine draws a series of patterned vectors. The pattern to use must already be specified in $C829. The number of vectors to draw minus 1 must be passed in in the A register. The vector list, pointed to by the X register, has the following format:
rel y, rel x, rel y, rel x, ...
ENTRY:
DP = $D0
X-reg points to the vector list
A-reg = the number of vectors to draw
$C829 contains the line pattern.
EXIT:
X-reg points to next byte after list
D-reg trashed