Atari XL - Page 249

Useful Memory Locations
237
702
703
704-707
708-712
741,741
743,744
752
755
756
763
764
765
53279
54018
58484
58487
o=No shift locks.
64
= CAPS lock on.
128 = CONTROL lock on.
24
== Text window off.
4 == Text window on.
Player-Missile colour registers 0 to 3.
Graphics colour registers 0 to 4.
Top of free RAM.
Start of free RAM.
0= Cursor on.
I = Cursor off.
Controls appearance of cursor and
characters.
Setting bit 0 makes the cursor opaque.
Setting bit 1 makes the cursor visible.
Setting bit 3 inverts the displayed
characters.
224 = Standard character set.
226 = Alternate character set.
ASCII code of last key pressed.
Internal code of last key pressed.
Holds colour data for XIO command.
Bi t 0 is zero if START is pressed.
Bit 1 is zero if SELECT is pressed.
Bit 2 is zero if OPTION is pressed.
POKE 53279, 8 retracts loudspeaker
cone.
POKE 53279, 0 extends loudspeaker
cone.
PO KE wi th 52 to start cassette
motor.
POKE with 60 to stop cassette.
X = USR(58484) gives RESET.
X = USR(58487) gives switch-on reset.