Atari 800

Player-Missile Base Address (PMBASE) = MSB of address.
Resolution is controlled by bit 4 of DMACTL.
ADDRESS
Two-line
resolution
(hex)
+180
+200
+280
+300
+380
+400
OFFSET
One-line
resolution
(hex)
+300
PMBASE*100(hex)
M
+400
----~~ J-.....;;;lL..-....&...--1~ /
PO
+400
P1
+600
P2
+700
P3
+800
Player-Missile
Vertical screen
map in memory
Missile
Number
TV SCREEN
/
/
/
/
/1
-
POl
I I
I I I
I I I I
... II
M2 •
I I
MO
-
P2
• W'
I I
I I
•
1 P1
~
M1
P31 M3
- - - :--r-1 .;:;..;.....--=~------'
I
I
I
1 Horizontal position
~~for each object is set
independently by 8
horizontal position
registers.
Each section of memory maps directly
onto total height of TV screen.
Object vertical position is determined
only by its location in its section
of memory. One byte of memory equals
1 or 2 television lines vertically.
Figure II. 2
P L A Y E R - M I S S I L E D M A
II.6