E
END,
56, 65, 66
erase
computer's memory, 35
program lines, 38
screen, 31
spaces and lines, 32
Error message, 29, 35, 37-38, 44, 46,
56, 68
Escape key, 14, 34, 40
exponent, 47-48
F
FOR,
58
FOR-NEXT, 57-63
nested FOR-NEXT loops, 62
with SOUND, 66, 68
FRE, 42-43
frequency, 65
G
garbage error, 37
GOSUB-RETURN, 68
GOTO, 41, 46, 55, 56
to maintain graphics screen
display, 72
with SOUND, 66
graphic symbols, 17, 30-31, 40
graphics capabilities, 68-76
graphics modes, 68
mode 0, 69, 72
mode 1, 70-72, 73
mode 2, 70-72, 73
mode 3, 73-75
mode 5, 75-76
mode 7, 75-76
H
Help key, 9, 11, 14, 34
I
IF-THEN, 52, 55-57
increments in counting loops, 59-60
infinite loops, 41, 50, 55, 56
INPUT, 43, 44, 53, 56
inserting
blank lines, 32
blank program lines, 38
blank spaces, 31-32
program lines, 36
Insert key, 15, 31, 32
installation of your computer, 5-8
instruction line
limit, 29, 39
numbering, 35, 36
INT,
51
international characters, 19
Inverse Video, 33, 40
to change colors in graphics
modes, 71, 73
to test keyboard, 11
J
joystick, 26
K
Keyboard Test, 11
keys, descriptions of, 13-16
L
Left Arrow key, 15, 31, 48
line breaks, 39
line numbering, 35, 36
LIST, 35, 36
logical line, 39
loop
counting, 57-63
delay, 61-63
FOR-NEXT, 57-63, 66, 68
GOTO, 41, 46, 55, 56, 66, 72
infinite, 41, 50, 55, 56
lowercase, 29-30
to change colors in graphics
modes, 71, 73
luminance, 69, 70
M
math functions
addition, 48
division, 49
multiplication, 49
order of execution, 49-50
subtraction, 48
math programs, 53
memory, 9-10, 23, 35, 36, 42-43
Memory Test, 9-10, 11
minus sign, 47, 48
modem, 26
monitor, 25
multiplication sign, 49
musical notes, 67-68
124
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