Atari 400 Technical Reference Manual page 479

H
<:
N
TV LINES
AFTER
START OF
DISPLAY
Player/
Missiles
16
M2
M3
CHECKERS DISPLAY
Color Clocks
>
32 (decimal)
PO
PI
P2 P3
38 3C SC 7C 9C BC
~
/
v
Player/Missile Horizontal Position
Register Values (hex).
End of Vertical Blank
24 Blank Lines
20 Characters across by 8 lines high
1 6 " " " " " "
8 Rows
16 Characters across
by
16 lines high
16 Characters across
by
8 lines high