Option Base, Out, Poke | Intel 9800758-02 manual

BASIC-SO

Commands and Statements

The example below shows a typical use of OPEN in an 110 program.See Chapter 5 for further details of disk random 110.

10OPEN "R" ,#3, "F1 :PERSON"

20GET #3,1

30FIELD #3,20 AS N$, 9 AS SS$

40PRINT N$,SS$

RUN

JONES, JOHN J. 517317010

Ok

OPTION BASE

The OPTION BASE command is used to begin indexing of arrays at 1 or O. By specifying an argument of 0 or 1, you can begin all arrays at 0 or 1. If present, OPTION BASE should precede all DIM statements and array references. If OP- TION BASE 1 is not specified, 0 is the default value.

OPTION BASE 011

OUT

The OUT statement writes the specified value to the specified 110 port. The value is an integer expression in the range 0 to 255.

OUT port number, expression

This example rings the bell on Intellec development systems using the RS-232 port.

OUTOF6H, 7

POKE

The POKE statement places the specified value into the memory location specified. The specified value is an expression that must round to an integer in the range 0-255. POKE can also accept hexadecimal and octal arguments, even though octal and hex constants over 32767 (decimal) are interpreted by BASIC-80 as negative numbers. It does this by adding 65536 to such arguments.

POKE location, expression

POKE OFFFFH, 0

POKE 65535,0

POKE 1777770,0

POKE -1,0

The instructions above set the top byte of memory to 0 in an Intellec development system having 64K of memory. Before using POKE, you should use the CLEAR command to reserve free memory. A POKE into BASIC or system code may cause BASIC or other software to fail.

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Intel 9800758-02 manual Option Base, Out, Poke

Contents

BASIC-SO Reference Manual A108/0979/7500 FL Preface Page Contents Illustrations Invoking BASIC-80 Chapter Introduction to BASIC-80 Filename ExamplesIntroduction to BASIC-80 Basic filename MEMTOPaddress Deleting a File Listing the Directory of a DiskRenaming a File Changing File Attributes 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 Hexadecimal Integer Constants ConstantsInteger Constants Decimal Integer Constants Single-Precision Floating-Point Constants Octal Integer ConstantsDouble-Precision Floating-Point Constants $ = Enter next data string String ConstantsString Variables This is a string constant YI,1 L4! = Csng l4 String Arrays BASIC-SO Operators in Order of Precedence Contd Arithmetic Operators String Expressions Logical OperatorsString Operator Numeric Expressions Entering and Editing Programs 30 A--=8xx*522537 Control-R a = 8*37 30 A=8*5230 A=8 30 A=8*52 30 A=8*37 If AB then SubcommandCommand 3D press 3, then D results Integer D If AB then 120 Else Null SET At this point, the other editing subcommands may be used Syntax of the X subcommand is Print Undefined SET. Enter a L Print Undefined SET The E subcommand is enteredInteger C character character Move the cursor to PRINT. Enter 2C RE L Syntax Error Messages BASIC-80 Error MessagesOverflow, Underflow, and Divide-by-Zero Error Trapping Trace Facility If line 40 is replaced with Error SimulationError Handling Restarting Program Execution Open 1,#1,F1DATES Opening a Sequential File If executed four times, it would read all eight values Refer to for further details of Print UsingWriting to a Sequential File Reading from a Sequential File Value of R$ would be Closing a Sequential File Defining a Random 1/0 Field-FIELD BuffersField #3, 20 AS N$ Field #3, 20 AS N$, 9 AS SS$ Disk File Input/Output To read the next record Opening and Closing a Random Disk FileReading from a Random 1/0 File Any of the parameters can be variables Double-precision value Writing to a Random 1/0 FileInteger Single-precision value MKI$ Clear expression,address Attrib Fdrive numberfilename, W1Attrib Fdrive numberfilename, WO Auto first lineJ, increment Close Commands and Statements Rules for function name are the same as for variable name DEF FNX Defsng Defdbl Defstr Defint Delete DIM END ErrorDIR Edit FOR-NEXT-STEP Error expressionExit Field GET I file number ,record number GETGosub For variable=expression to expression Step expression Input IF-THEN-ELSEGoto List KillLET Line Input Load LSET, Rset NEW Merge 9 16 Next On ... Goto On ... GosubOpen OUT Option BasePoke Print Print UsingString Fields If X$=SEVEN and Y$=EIGHT, the results of line 40 would be Numeric fields PUT Prun Read Randomize REM Return Resume 60 END SaveRUN line numberlstring expression ,F Line number RUN filename ? 5,8,2 TRON, Troff Width Wait ATN ABS Cint CHR$Functions AO/o = CsngCVI CVS 10 A# = 1.00/3.00 EOF Dskf Ok· FIX INP HexsInputs Instr INTLEFT$ LOG LENLOC LOF MKI$ MKS$ MKD$ MID$OCT$ RIGHT$ string,integer RightsPeek expression POS integer 10 a =1 SGNSIN Spaces SQRexpression SPCSPC integer If A$ = 2 then Print Correct Else Goto TAB expression STR$ expressionTAN 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 To resume program execution after it is stopped by To halt program execution and return to commandLevel To tab across the linePage 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 Executable Files Generating Boot-Loaded and PROM-Based VersionsBASIC-80 Source Files BASIC-80 Object Files Generating a Boot-Loaded RMX/80 BASIC-80 This option enables your user-written I/O drivers if you That are not boot loadedThis option is used to allocate memory. It is 1 if the boot Setting baud rates, refer to the RMX/SO Users Guide 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 ISBC SO/10 System Clock Configuring DFS on an iSBC 80/10Adding BASIC-SO to an Existing RMX/SO Configuration Configuration Requirements 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