Atari XL - Page 248

APPENDIX 9
USEFUL MEMORY LOCATIONS
LOCATION
16
18,19,20
65
82
83
84
85,86
87
88,89
93
94,95
128,129
656
657,658
144,145
186,187
195
212,213
251
559
694
DESCRIPTION
POKE with 64 and POKE 53774
with 64 to disable BREAK key.
Real time clock.
Poke with 0 to hear sound from
cassette during loading.
Poke wi th 1 to stop sound.
Left margin of mode 0 text display.
Right margin of mode 0 display.
Current cursor row.
Current cursor column.
Current display mode.
Start of screen memory.
Contains a copy of the character
underneath the cursor.
Curren t cursor address.
Start of BASIC memory.
Cursor row in text window.
Cursor column in text window.
Top of BASIC memory.
Line number of error found by TRA P.
Error number of error found by
TRAP.
Value returned by USR function.
0= Radians mode.
6
= Degrees mode.
POKE with 0 to disable display. See
Chapters 14, 15.
0= Keyboard gives normal
characters.
Non-zero = Keyboard gives inverse
video characters.
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