Sharp MZ-3500 - Manual (Page 46)

M 7. 3500
2) Straight line drawing
f j OOOO
0028
0001
0027
0050
VRAM 16 bit
structure
Example to draw a straight line from (X, Y) = (3, 1) to (X,
Y) = (635, 1).
Coordinates must be changed to absolute addresses.
(3, 1) — absolute address = 0028H
Dot address = 2H
Displacement between two points when the line draw
direction is OA (to the right): X = 635-3 = 632 (=278H),
Y=0
Whereas.
CSRW C 4 9H
PI 28H
EAD L ,
P2 OOH
P3 20H dAU
TEXTW C 7 8H
PI
FF
Kind
of
1 P2
FF
VECTW C 4 CH
PI
OAH } Drawing
P2 78H
■ 1 AX 1
P3 02H
P4 88H
2 1
¿lY
1
P5 H)H
P6 1 OH
P7
FBH
2 1 AY 1
P8 OOH ■
P9 OOH
2 1 AY 1
WRITE C 2 3H
VECTE C 6CH
■ 2 IzYX I
[Explanation]
Specify the kind of line by TEXTW, using C for command
code and P for parameter, and specify the line drawing
direction using VECTW and above four values using X and
Y. The rest will be same the dot display It is also possible
to display a dot using the line drawing method for any line
drawing direction using X = Y = 0.