Draw_VLc ($F3CE)
This routine draws vectors between the set of (y,x) points pointed to by the X register. The number of vectors to draw is specified as the first byte in the vector list. The current scale factor is used. The vector list has the following format:
count, rel y, rel x, rel y, rel x, ...
ENTRY:
DP = $D0
X-reg points to the vector list
EXIT:
X-reg points to next byte after list
D-reg trashed