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

 

Source