Atari 800 - Page 47

GRAFM (Missile Graphics Registers)(D011): This address writes data
directly into the Missile Graphics Register, independent of DMA.
I D7 : D6 I D5 : D4 I D3 : D2 I D1 : DO
L R
~
M3 M2 M1 MO
SIZEPO- SIZEP3 (Player Size)(PO D008, P1 D009, P2 DOOA, P3 DOOB):
These addresses write data into the Player Size Control Registers.
Not
Used
D1
0
0
1
1
DO
0
1
0
1
Horizontal Size
Register (Player)
Normal Size
(8 color clocks wide)
Twice Normal Size
(16 color clocks wide)
Normal Size
4 Times Normal Size
(32 color clocks wide)
With normal size objects, each bit in the graphics register corresponds
to one color clock. For larger objects, each bit is extended over mor~than
one color clock.
SIZEM (Missile Size)(DOOC): This address writes data into the Missile
Size Control Register •
.... I..:::D..:..7.....~.-: ..:::D~6 .....~.-..:::D=-5 ..... :I....,;;;,D-:..:4 -~....~D 3 : D 2
......__,__, ......__,__, ~
M3 M2 M1
I
D1 I DO
~
MO
0 0
0 1
1 0
1
1
Horizontal Size
Register (Missile)
Normal Size
(2 color clocks wide)
Twice Normal Size
(4 color clocks wide)
Normal Size
4 Times Normal Size
(8 color clocks wide)
HPOSPO- HPOSP3 (Player Horizontal Position)(PO DOOO, P1 D001, P2 D002,
P3 D003):
These addresses write data into the Player Horizontal Position
Register (see display diagram in section IV). The horizontal positon value
determines the color clock location of the left edge of the object. Hex 30
is the left edge of a standard width screen. Hex DO is the right edge of a
standard screen.
D7 D6 D5 D4
D3
D2
D1
DO
III.10