Draw_VLp_7F ($F408)

These routines force the scale factor to 0x7F, and then process the vector list pointed to by the X register. The vector list has the following format:

pattern, rel y, rel x
pattern, rel y, rel x
. . .
. . .
pattern, rel y, rel x
0x01

The list is terminated by a pattern byte with the high bit cleared.

ENTRY:

DP = $D0

X-reg points to the vector list

 

EXIT:

X-reg points to the terminator byte

D-reg trashed

Source