Radio Shack CTR-118 User Manual download pdf (Page 127)

10-7

Expansion of RAM Memory

The TRS-80 Expansion Interface has provisions for adding extra RAM

memory. This is done by adding RAM memory chips. You can add up to

32,768 additional bytes of memory. For price information and free

installation, see your Radio Shack store or dealer.

1 2 ... 122 123 124 125 126 127 128 129 130 131 132 ... 195 196

LIMITED WARRANTY 2
One Tandy Center 3
Fort Worth, Texas 76102 3
CONTENTS 5
This Reference Manual and You 7
Setting up the System 9
Notes on Using the Recorder 10
Special Notes: 11
1 / General Information 13
Operating Modes 14
Special Function Keys 15
Variable Names 16
Variable Types 16
Arithmetic Operators 17
Relational Operators 18
String Operators 19
Order of Operations 19
Intrinsic Functions 20
Graphics 20
Error Messages 20
Abbreviations 20
Keyboard Rollover 21
Glossary for LEVEL II BASIC 22
2 / Commands 23
CLOAD? " 25
CSAVE"1" 26
CSAVE"A" 26
DELETE 5 26
DELETE 11-18 26
3 / Input-Output 31
@ position, item list 33
PRINT TAB 33
(expression) 33
PRINT USING 34
PRINT #-1 42
INPUT #-1 42
Sample Program 43
10 INPUT#-1,A1,B$,L$ 43
20 PRINT A1,B$,L$ 43
40 GOTO 10 43
4 / Program Statements 45
10 DEFINT A,I,N 46
10 DEFINT I-N 46
100 DEFSNG I,W-Z 47
10 DEFDBL S-Z, A-E 47
10 DEFSTR L-Z 48
10 CLEAR 1000 48
ON ERROR GOTO 57
Data Conversion 62
Typing of Constants 62
Type Conversion 63
5 / Strings 67
String Input/Output 68
String Comparisons 69
String Operations 70
String Space 70
(string) 71
(string, n) 74
STRING$ 76
Coding/Decoding Program 78
Instring Subroutine 78
6 / Arrays 81
Other Types of Arrays 84
7 / Arithmetic Functions 89
100 K%=CINT(X#)+CINT(Y#) 90
100 Y=COS(X+3.3) 90
100 PRINT CSNG(A#+B#) 90
100 PRINT EXP(-X) 91
100 Y=ABS(A-FIX(A)) 91
100 Z=INT(A*100+.5)/100 91
100 PRINT LOG(3.3*X) 91
8 / Special Features 95
ERR /2+1 98
(address) 100
CALL 0A7FH 103
JP 0A9AH 103
(variable name) 107
Logical Operators 109
20 GOTO 10 111
9 / Editing 113
ENTER key 114
Space-bar 114
100 FOR I=1 TO 10_ 115
100 FOR I=_ 115
L (List Line) 116
X (Extend Line) 116
I (Insert) 117
A (Cancel and Restart) 117
E (Save Changes and Exit) 117
Q (Cancel and Exit) 118
H (Hack and Insert) 118
D (Delete) 118
100 FOR I=1 TO 1_ 119
10 / Expansion Interface 121
Line Printer 122
LPRINT CHR$(10) 124
LINE ONE 124
LINE TWO 124
LINE THREE 124
POKE 16424,40 125
POKE 16425,0 125
Mini-Disks - (DISK BASIC) 126
Additions to LEVEL II 126
Expansion of RAM Memory 127
11 / Saving Time and Space 129
Speeding Up Execution 130
Appendix 131
A / Level II Summary 133
Commands 135
Input/Output Statements 138
Program Statements 140
String Functions 144
Arithmetic Functions* 145
Special Functions 146
LEVEL II Reserved Words* 148
B / Error Codes 151
Explanation of Error Messages 152
Hard-To-Find Errors 153
C / TRS-80 Character Codes 155
Decimal/Hexadecimal Codes 156
Control Codes: 0-31 157
Graphics Codes: 128-191 158
Graphic Characters 161
D / Memory Map 163
Important Addresses 164
F / Derived Functions 167
G / Base Conversions 169
H / User Programs 173
Sort Routine 175
Space-Ship Lander 176
Customer Information 178
Target Practice 180
Using Your Cassette Deck 185
LEVEL II 187
Hints and Tips 187

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Radio Shack CTR-118 User Manual Page 127

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