Next, 9 16 | Intel 9800758-02 specs

BASIC-80

Commands and Statements

NEXT

The NEXT statement is used with a previous FOR statement to end an iteration of a FOR-NEXT loop; when BASIC-SO encounters a NEXT statement, control passes back to the statement line containing the last FOR statement. If no index variable is specified, BASIC-SO increments the variable specified in the last FOR statement. Each NEXT can end more than one loop if the index variables used in each loop are given separated by commas.

The syntax of NEXT is:

NEXT [Variable] [, Variable] ...

10FOR A=1 TO 5

20PRINT A* A;

30NEXT A

40END

RUN

14 9 16 25

Ok

NULL

The NULL command specifies the number of null characters printed at the end of a printed line, following the carriage return. This feature is used with hard copy ter- minals that require a certain number of null characters that set carriage return timing.

NULL number of null characters to be transmitted

ON ERROR GOTO

The ON ERROR OOTO statement transfers program control to the specified line number when error conditions occur or an ERROR instruction simulates an error within a program. The ERR function is set to the applicable error code and the ERL function is set to the applicable line number.

The instruction line ON ERROR OOTO 0 removes the effect of any previous ON ERROR OOTO, so that errors cause messages to print and halt execution. If ON ERROR OOTO 0 is executed within an error-handling routine (after an error but before a RESUME) the proper error message prints and execution halts immediately.

If an error occurs in an error routine, after an ON ERROR OOTO branch and before a RESUME, the ON ERROR OOTO has no effect. This means that if an ON ERROR OOTO is in effect, and two errors (or ERROR commands) occur without an intervening RESUME, the second error prints an error message and halt execution.

ON ERROR GOTO line number

10 ON ERROR GOTO 200

20 ERROR 11

200 PRINT "ERROR" ERR "AT LINE" ERL

210 RESUME NEXT

6-13

Image 53

Intel 9800758-02 manual Next, 9 16

Contents

BASIC-SO Reference Manual A108/0979/7500 FL Preface Page Contents Illustrations Invoking BASIC-80 Chapter Introduction to BASIC-80 Introduction to BASIC-80 ExamplesBasic filename MEMTOPaddress Filename Renaming a File Listing the Directory of a DiskChanging File Attributes Deleting a File Save LP ,A You can now run, list, or edit the program Statements Commands BASIC-80 Statements BASIC-80 Commands Contd BASIC-80 Functions BASIC-80 Statements Contd BASIC-80 Functions Contd Functions Representing Data Integer Constants ConstantsDecimal Integer Constants Hexadecimal Integer Constants Double-Precision Floating-Point Constants Octal Integer ConstantsSingle-Precision Floating-Point Constants String Variables String ConstantsThis is a string constant $ = Enter next data string YI,1 L4! = Csng l4 String Arrays BASIC-SO Operators in Order of Precedence Contd Arithmetic Operators String Operator Logical OperatorsNumeric Expressions String Expressions Entering and Editing Programs 30 A=8 30 A=8*5230 A=8*52 30 A=8*37 30 A--=8xx*522537 Control-R a = 8*37 Command 3D press 3, then D results SubcommandInteger D If AB then If AB then 120 Else Null SET At this point, the other editing subcommands may be used Syntax of the X subcommand is Integer C character character Print Undefined SET The E subcommand is enteredMove the cursor to PRINT. Enter 2C RE L Print Undefined SET. Enter a L Overflow, Underflow, and Divide-by-Zero BASIC-80 Error MessagesSyntax Error Messages Error Trapping Trace Facility Error Handling Error SimulationRestarting Program Execution If line 40 is replaced with Open 1,#1,F1DATES Opening a Sequential File Writing to a Sequential File Refer to for further details of Print UsingReading from a Sequential File If executed four times, it would read all eight values Value of R$ would be Closing a Sequential File Field #3, 20 AS N$ BuffersDefining a Random 1/0 Field-FIELD Field #3, 20 AS N$, 9 AS SS$ Disk File Input/Output Reading from a Random 1/0 File Opening and Closing a Random Disk FileAny of the parameters can be variables To read the next record Integer Writing to a Random 1/0 FileSingle-precision value Double-precision value MKI$ Attrib Fdrive numberfilename, WO Attrib Fdrive numberfilename, W1Auto first lineJ, increment Clear expression,address Close Commands and Statements Rules for function name are the same as for variable name DEF FNX Defsng Defdbl Defstr Defint Delete DIM DIR ErrorEdit END Exit Error expressionField FOR-NEXT-STEP Gosub GETFor variable=expression to expression Step expression GET I file number ,record number Goto IF-THEN-ELSEInput LET KillLine Input List Load LSET, Rset NEW Merge 9 16 Next Open On ... GosubOn ... Goto Poke Option BaseOUT String Fields Print UsingPrint If X$=SEVEN and Y$=EIGHT, the results of line 40 would be Numeric fields PUT Prun Read Randomize REM Return Resume RUN line numberlstring expression ,F SaveLine number RUN filename 60 END ? 5,8,2 TRON, Troff Width Wait ATN ABS Functions CHR$Cint CVI CVS Csng10 A# = 1.00/3.00 AO/o = EOF Dskf Ok· FIX Inputs HexsINP LEFT$ INTInstr LOC LENLOF LOG OCT$ MID$MKI$ MKS$ MKD$ Peek expression RightsPOS integer RIGHT$ string,integer SIN SGNSpaces 10 a =1 SPC integer SPCIf A$ = 2 then Print Correct Else Goto SQRexpression TAN expression STR$ expressionTAB expression 60 AO/o = Here is an example of how the USRn statement is used Table A-I. BASIC-80 Error Codes Appendix a BASIC-SO Error Codes Table A-I. BASIC-SO Error Codes Contd Appendix B BASIC-SO Reserved Words Page Level To halt program execution and return to commandTo tab across the line To resume program execution after it is stopped byPage Appendix D Ascii Codes Table D-l. Ascii Code List BEL Table D-2. Ascii Code Definition Appendixe Calling Subroutines Figure B-1. Internal Representation of Numbers and Strings RESULT=USR%1VARPTRA, VARPTRB, VARPTRC» PRINTA+B+C= Result Some Real Examples Figure E-2 /8085 Assembly Language Program Figure E-3. PL/M-80 Program Appendix F RMX/SO BASIC-SO ISIS-II BASIC-SO Initializing the Predefined RMX/SO BASIC-SO Configuration OOOOH-OFFFH Table F-l. Sample Configuration Jumper Wiring BASIC-80 Source Files Generating Boot-Loaded and PROM-Based VersionsBASIC-80 Object Files BASIC-80 Executable Files Generating a Boot-Loaded RMX/80 BASIC-80 This option is used to allocate memory. It is 1 if the boot That are not boot loadedSetting 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 Adding BASIC-SO to an Existing RMX/SO Configuration Configuring DFS on an iSBC 80/10Configuration Requirements ISBC SO/10 System Clock Public Variables Open 0,#1, L1LlST Adding User-Written I/O Drivers to RMX/SO BASIC-SO Figure F-S. Sample User-Written 1/0 Driver Routine Burning a BASIC-80 Program Into Prom Altering BASIC-80 Workspace Baprom F1HEATER.BAS Page Index Ase BASIC-80 RIGHT$,7-1O Request for Readerscomments 111111