Commodore VIC-20 - Page 399

A
Abbreviations, 82-83, 334
ABS function,
112, 371
AND operator, 72
"bit-masking", 161,211
Animation,
185-91
delay loops, 187
sound combined with, 246-48
using custom characters for, 204-08
using graphics characters for, 185-87
Arrays, 77-79
ASC function,
114, 371
Assignment statement, 84
ATN function,
112, 372
Auxiliary color
B
defined, 215
setting, 215
BLOCK-ALLOCATE (disk instruction), 272
BLOCK-FREE (disk instruction), 275
BLOCK-READ (disk instruction),
269
BLOCK-WRITE (disk instruction), 273
BUFFER-POINTER (disk instruction), 274
buffers, 252
c
Cassettes. See also Datasette
selection and care,
26
write-protection, 26
Character memory
changing location of, 223-25
contents,
192
defined, 192
locating characters in, 196
CHR$ function, 103, 114, 128, 278, 372
Index
Clock, Real-time, 146-50
jiffies defined,
147
reading the time, 147
setting the time, 146
TIME and TIME$ variables, 147
timing an event, 150
CLOSE statement, 55, 284, 341
CLR/HOME key, 14
CLR statement, 342
CMD statement, 55, 284, 342
Color
control keys,
14
with PRINT statement, 179-80
Color memory
contents,
182-83
defined, 182
location, 182
location dependent on screen memory, 224
Computed GOSUB statement, 90
Computed GOTO statement, 90,
142
CONT statement, 343
COS function, lJ3, 373
CRSR keys. See Cursor control keys
Cursor
control keys,
14-19
moving within a program, 126, 144
Custom characters
animation with, 204-08
D
combining with built-in character set, 203
designing 197-201
programming techniques for, 202-04
replacing standard character set,
199
DATA statement, 86, 242, 343
Datasette
cleaning, 24
385