Merge, New | Intel 9800758-02 specification

Commands and Statements

BASIC-80

cannot later be assigned values with the LET statement. This is because strings are assigned new storage locations when given new values and this destroys the effect of the FIELD statement. Accordingly, the LSET and RSET statements must be used to assign new values. These commands may also be used with normal string statements. If the assigned string value is shorter than the space reserved for the string variable in the FIELD statement, LSET left justifies the string, adding blanks (ASCII 20H) as needed. RSf:T right justifies the string in the same way. If the string is longer than the space reserved, the extra characters are ignored. LSET and RSET may be used with string variables that have not been fielded. Unlike normal string assignment, the length of the receiving string is not changed by an LSET or RSET assignment.

LSET string variable = string expression

RSET string variable = string expression

10A$ = "1 23456"

20RSET A$ = "A B"

30PRINT A$; "X"

40LSET A$ = "C 0"

50PRINT A$; "X"

RUN

ABX

CO X

Ok

MERGE

The MERGE command reads a program from disk and combines it with the current program without changing line numbers of either program. If the new program and the current program have instruction lines with the same line numbers, the new in- struction lines replace the current ones. The new program must have been saved in ASCII format. MERGE sets all variables and arrays to zero. If used within a pro- gram, the program will end. A given string expression must resolve to an ISIS-II filename.

MERGE string expression

MERGE ":F4: EVAL.BAS"

Ok

NEW

The NEW command deletes the current program and clears all variables and arrays. If a program has not been saved and the NEW command is given, the program is lost.

NEW

In the sample program below, the program has been deleted by the NEW command. The LIST command will not list it, or any program, until another is read from a peripheral device or entered line-by-line.

240PRINT "end of program"

250PRINT

260PRINT

270END

NEW Ok

LIST Ok

6-12

Image 52

Intel 9800758-02 manual Merge, New

Contents

BASIC-SO Reference Manual A108/0979/7500 FL Preface Page Contents Illustrations Chapter Introduction to BASIC-80 Invoking BASIC-80 Examples Introduction to BASIC-80Basic filename MEMTOPaddress Filename Listing the Directory of a Disk Renaming a FileChanging File Attributes Deleting a File You can now run, list, or edit the program Save LP ,A Commands Statements BASIC-80 Commands Contd BASIC-80 Statements BASIC-80 Statements Contd BASIC-80 Functions BASIC-80 Functions Contd Representing Data Functions Constants Integer ConstantsDecimal Integer Constants Hexadecimal Integer Constants Single-Precision Floating-Point Constants Octal Integer ConstantsDouble-Precision Floating-Point Constants String Constants String VariablesThis is a string constant $ = Enter next data string L4! = Csng l4 YI,1 String Arrays Arithmetic Operators BASIC-SO Operators in Order of Precedence Contd Logical Operators String OperatorNumeric Expressions String Expressions Entering and Editing Programs 30 A=8*52 30 A=830 A=8*52 30 A=8*37 30 A--=8xx*522537 Control-R a = 8*37 Subcommand Command 3D press 3, then D resultsInteger D If AB then If AB then 120 Else Null SET Syntax of the X subcommand is At this point, the other editing subcommands may be used Print Undefined SET The E subcommand is entered Integer C character characterMove the cursor to PRINT. Enter 2C RE L Print Undefined SET. Enter a L Syntax Error Messages BASIC-80 Error MessagesOverflow, Underflow, and Divide-by-Zero Error Trapping Trace Facility Error Simulation Error HandlingRestarting Program Execution If line 40 is replaced with Opening a Sequential File Open 1,#1,F1DATES Refer to for further details of Print Using Writing to a Sequential FileReading from a Sequential File If executed four times, it would read all eight values Closing a Sequential File Value of R$ would be Defining a Random 1/0 Field-FIELD BuffersField #3, 20 AS N$ Disk File Input/Output Field #3, 20 AS N$, 9 AS SS$ Opening and Closing a Random Disk File Reading from a Random 1/0 FileAny of the parameters can be variables To read the next record Writing to a Random 1/0 File IntegerSingle-precision value Double-precision value MKI$ Attrib Fdrive numberfilename, W1 Attrib Fdrive numberfilename, WOAuto first lineJ, increment Clear expression,address Commands and Statements Close DEF FNX Rules for function name are the same as for variable name Defsng Defdbl Defstr Defint DIM Delete Error DIREdit END Error expression ExitField FOR-NEXT-STEP GET GosubFor variable=expression to expression Step expression GET I file number ,record number Input IF-THEN-ELSEGoto Kill LETLine Input List LSET, Rset Load Merge NEW Next 9 16 On ... Goto On ... GosubOpen OUT Option BasePoke Print Print UsingString Fields Numeric fields If X$=SEVEN and Y$=EIGHT, the results of line 40 would be Prun PUT Randomize Read REM Resume Return Save RUN line numberlstring expression ,FLine number RUN filename 60 END TRON, Troff ? 5,8,2 Wait Width ABS ATN Cint CHR$Functions Csng CVI CVS10 A# = 1.00/3.00 AO/o = Dskf EOF FIX Ok· INP HexsInputs Instr INTLEFT$ LEN LOCLOF LOG MKI$ MKS$ MKD$ MID$OCT$ Rights Peek expressionPOS integer RIGHT$ string,integer SGN SINSpaces 10 a =1 SPC SPC integerIf A$ = 2 then Print Correct Else Goto SQRexpression TAB expression STR$ expressionTAN expression Here is an example of how the USRn statement is used 60 AO/o = Appendix a BASIC-SO Error Codes Table A-I. BASIC-80 Error Codes Table A-I. BASIC-SO Error Codes Contd Appendix B BASIC-SO Reserved Words Page To halt program execution and return to command LevelTo tab across the line To resume program execution after it is stopped byPage Table D-l. Ascii Code List Appendix D Ascii Codes Table D-2. Ascii Code Definition BEL Appendixe Calling Subroutines Figure B-1. Internal Representation of Numbers and Strings Some Real Examples RESULT=USR%1VARPTRA, VARPTRB, VARPTRC» PRINTA+B+C= Result Figure E-2 /8085 Assembly Language Program Figure E-3. PL/M-80 Program Appendix F RMX/SO BASIC-SO Initializing the Predefined RMX/SO BASIC-SO Configuration ISIS-II BASIC-SO Table F-l. Sample Configuration Jumper Wiring OOOOH-OFFFH Generating Boot-Loaded and PROM-Based Versions BASIC-80 Source FilesBASIC-80 Object Files BASIC-80 Executable Files Generating a Boot-Loaded RMX/80 BASIC-80 That are not boot loaded This option is used to allocate memory. It is 1 if the bootSetting baud rates, refer to the RMX/SO Users Guide This option enables your user-written I/O drivers if you ISBC 80/20-4 Generating a PROM-Based RMX/80 BASIC-80 Prom F1 RMX820.L1BSTART, & FOBASCM.OBJ,& FORMXBAS.LlB F1 DFSDIR. L1BDIRECTORY ,RENAM E,& F1 MTI810.L1B Configuring DFS on an iSBC 80/10 Adding BASIC-SO to an Existing RMX/SO ConfigurationConfiguration Requirements ISBC SO/10 System Clock Public Variables Adding User-Written I/O Drivers to RMX/SO BASIC-SO Open 0,#1, L1LlST Figure F-S. Sample User-Written 1/0 Driver Routine Altering BASIC-80 Workspace Burning a BASIC-80 Program Into Prom Baprom F1HEATER.BAS Page Index Ase BASIC-80 RIGHT$,7-1O Request for Readerscomments 111111