Turbo Basic

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VARPTR$ functionFunctionSyntaxRemarksSee AlsoExampleVARPTR$ returns a pointer to a variable in string form.s$ = VARPTR$(variab7e)variable is any numeric or string variable or element of an array.VARPfR$ returns a pointer to a variable in string form, and isused primarily in the PLAY and DRAW statements to include variablenames within command strings.DRAWPLAYVARSEGI switch into medium resolution graphics modeSCREEN 1House$ = "U20 G5 E20 F20 H5 020 L30"DRAW House$DRAW "BE3"DRAW "Pl,3"FOR 1% = 1 TO 280 STEP 40DRAW "M = " + VARPTR$(I%) + ",40"DRAW House$NEXT 1%END I end the programTurbo Basic Reference Directory 369
VARSEG functionFunctionSyntaxRemarksSee AlsoExampleVARSEG returns the segment address of a variable.y = VARSEG(variable)variable is any numeric or string variable or element of an array.Because of Turbo Basic's expanded memory model. VARSEG isrequired along with VARPTR to fully define the address of avariable.VARSEG returns a numeric value in the range 0 to 65,535. UseVARSEG in conjunction with VARPTR to get the address of a variable,so that a CALL can tell an assembly language routine wherethe argument it should process is located in memory.Turbo Basic programs put all nonarray variables in a single segmentthat can be up t064K in length. Therefore, using VARSEG onall the nonarray variables in a given program always returns thesame value. In fact, this segment value is the default for statementsthat rely on DEF SEC (for example, PEEK, POKE).VARPTR, B% = 55DEF SEG = VARSEG(B%)Address% = VARPTR(B%)PRINT PEEK(Address%)END 'end the program370Turbo Basic Owner's Handbook
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Turbo Basic ~Owner;'s HandbookCopyr
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A First Program ...................
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Nondelimited Sequential Files .....
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GOSUB statement ...................
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RSET statement ....................
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Output ............................
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IntroductionTurbo Basic is a self-c
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TypographyThe body of this manual i
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c H A p T E R 1About BASICLike Main
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soon as you press the Enter key (th
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Turbo Basic's enormous compilation
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c H A p T E R 2Touring Turbo BasicT
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your AUTO EXEC. BAT file (see Appen
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• Run to execute programs or comp
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Block operations can be performed w
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_ •. --------------------",Turbo
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As its name implies, the selections
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I..ILI 1 •••••roaa=lfte(I
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Use the Directory option in the Fil
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The System WindowsTurbo Basic provi
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c H A p T E R 3Turbo Basic: The Pro
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The editor uses approximately 50 co
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Basic Movement CommarulsHere are so
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Use Overwrite mode to replace old t
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Miscellaneous Editing CommandsThis
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When the search string is specifIed
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The CompilerTurbo Basic's compiler
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Turbo Basic's context-sensitive hel
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Be certain to choose unique file na
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detected, you are placed in the edi
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• Bounds• Overflow• Stack tes
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Note that Overflow checking occurs
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.... ---_._----- .-ltes .... 'e ---
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Save Options/Window/SetupS saves th
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When a run-time error occurs, Turbo
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c H A p T E R 4Turbo Basic: The Lan
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Examples include:SORTSUBROUTINE:Ex;
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Reseroed WordsTurbo Basic reserves
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Numbers in Turbo·BasicThe care and
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y Interpretive BASIC. (For more inf
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A numeric constant with a decimal p
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VariablesA variable is an identifie
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In an enhancement to Interpretive B
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Even though this code compiles with
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ExpressionsAn expression consists o
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Relational OperatorsRelational oper
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An OR mask sets selected bits of an
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FunctionsThere are two types of fun
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Line 170 determines the value FNFac
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Consider this program that defines
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ActionReturn a valueCalling methodP
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Doing sO'will not, however, change
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Local arrays are automatically deal
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equal to 170; 3 passes this test, s
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Note that the space character canno
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parent of this directory. For examp
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to write it all back at the end. In
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Consider the following program and
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double-precision values into Micros
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And following is a sample program u
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Device I/OTurbo Basic supports so-c
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Line 1, Column 1 Columns (1-80)80~L
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Absolute and Relative CoordinatesMo
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c H A p T E R 5Turbo Basic Referenc
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pathA string expression describing
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$COM metastatementFunctionSyntaxRem
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$EVENT metastatementFunctionSyntaxR
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$INCLUDE metastatementFunctionSynta
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$INLINE metastatementFunctionSyntax
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$SOUND metastatementFunctionSyntaxR
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$STATIC metastatementFunctionSyntax
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ASC functionFunctionSyntaxRemarksRe
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See AlsoExampleConvert degrees to r
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BIN$ functionFunctionSyntaxRemarksS
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BSAVE statementFunctionSyntaxRemark
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Integer% = 1Longlnt& = 2SinglePrel
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See AlsoExampleREG as a function re
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CDBLfunctionFunctionSyntaxRestricti
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CHAIN statementFunctionSyntaxRemark
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CHDIR statementFunctionSyntaxRemark
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CINT functionFunctionSyntaxRemarksD
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oExampleaspect is a numeric express
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PRINTI display no longer existing s
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CLOSE statementFunctionSyntaxRemark
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COLOR statement (graphics mode)Func
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Example I This program demonstrates
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RestrictionsBackground values of 0
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PRINT IICOM Port input: II;ComPortI
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COMMON statementFunctionSyntaxRemar
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COS functionFunctionSyntaxRemarksSe
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CSRLIN functionFunctionSyntaxRemark
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FOR I% = 1 TO 5 I read data from fi
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DATA statementFunctionSyntaxRemarks
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DATE$ system variableFunctionSyntax
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DEF FN/END DEF statementFunctionSyn
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See AlsoExampleLOCALSHAREDSTATIC$ST
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Restrictionsvariable j's first appe
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, define segment for POKE and BSAVE
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DIM statementFunctionSyntaxRemarksD
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DO/LOOP statementFunctionSyntaxDO/L
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FunctionSyntaxRemarksDRAW draws sha
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RestrictionsExampleIn each instance
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ENDMEM functionFunctionSyntaxRemark
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ENVIRON$ functionFunctionSyntaxRema
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ERADRfunctionFunctionSyntaxRemarksS
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ERDEV, ERDEV$functionsFunctionSynta
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IIan insufficient number of dataele
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EXIT statementFunctionSyntaxRemarks
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PRINT RND(Dummy%)I this is the same
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FIELD statementFunctionSyntaxRemark
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FIX functionFunctionSyntaxRemarksSe
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The counter variable in the NEXT st
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GET statement (fiks)FunctionSyntaxR
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Turbo Basic stores the graphics dat
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CALL CreateFile, create data file,
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GOTO statementFunctionSyntaxRemarks
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IF statementFunctionSyntaxRemarksDi
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IF block statementFunctionSyntaxIF
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INCR statementFunctionSyntaxRemarks
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ExamplePRINT "Enter some characters
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INPUT statementFunctionSyntaxRemark
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I read a line of text from theI seq
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INS TAT functionFunctionSyntaxRemar
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INT function.FunctionSyntaxRemarksS
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KEY statementFunctionSyntaxRemarksK
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KEY(n) statementFunctionSyntaxRemar
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KILL statementFunctionSyntaxRemarks
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LCASE$ functionFunctionSyntaxRemark
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LEN functionFunctionSyntaxRemarksEx
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LINE statementFunctionSyntaxRemarks
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UNE INPUT statementFunctionSyntaxRe
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I input an entire line regardless o
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LOCAL statementFunctionSyntaxRemark
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LOF functionFunctionSyntaxRemarksEx
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LPOS functionFunctionSyntaxRemarksS
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LSET statement, FunctionSyntaxRemar
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MID$ functionFunctionSyntaxRemarksS
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MKDIR statementFunctionSyntaxRemark
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Example OPEN "MKILSD.DTA" AS 11 LEN
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MTIMERfunction and statementFunctio
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OCT$ functionFunctionSyntaxRemarksS
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ON ERROR statementFunctionSyntaxRem
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ON/GOTO statementFunctionSyntaxRema
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ON KEY(IO) GOSUB GoodByeI turn FlO
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ON PLAY statementFunctionSyntaxRema
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ON STRIG statementFunctionSyntaxRem
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ON TIMER statementFunctionSyntaxRem
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See AlsoExampleThe two forms of the
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, move the file pOinter to the end
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See AlsoExampleThe msec argument of
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OUT statementFunctionSyntaxRemarksE
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For example, the following pattern
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PALETTE, PALETTE USING statementsFu
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PEEK functionFunctionSyntaxRemarksS
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PEN statementFunctionSyntaxRemarksS
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PLAY statementFunctionSyntaxRemarks
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See AlsoExampleMF"Music Foreground"
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POINT functianFunctionSyntaxRemarks
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POS functianFunctionSyntaxRemarksSe
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PRINT statementFunctionSyntaxRemark
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PRINT # and PRINT # USING statement
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PRINT USING statementFunctionSyntax
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PSET statementFunctionSyntaxRemarks
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PUT statement (graphics)FunctionSyn
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PUT$ functionFunctionSyntaxRemarksS
Page 334 and 335: READ statementFunctionSyntaxRemarks
Page 336 and 337: ExampleDEFINT a-zDIM a(100)DIM Fill
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Page 348 and 349: SCREEN statementFunctionSyntaxRemar
Page 350 and 351: SEEK statementFunctionSyntaxRemarks
Page 352 and 353: SELECT statementFunctionSyntaxRemar
Page 354 and 355: SHARED statementFunctionSyntaxRemar
Page 356 and 357: SIN functionFunctionSyntaxRemarksSe
Page 358 and 359: SPACE$ functionFunctionSyntaxRemark
Page 360 and 361: SQRfunctionFunctionSyntaxRemarksExa
Page 362 and 363: STICK/unctionFunctionSyntaxRemarksS
Page 364 and 365: STR$ functionFunctionSyntaxRemarksS
Page 366 and 367: STRIG statementFunctionSyntaxRemark
Page 368 and 369: SUB/END SUB, SUB INLINE statements,
Page 370 and 371: See AlsoExamplecreates three local
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Page 374 and 375: TAN functionFunctionSyntaxRemarksSe
Page 376 and 377: TIMER functionFunctionSyntaxRemarks
Page 378 and 379: THON and THOFF commandsFunctionSynt
Page 380 and 381: UBOUND functionFunctionSyntaxRemark
Page 382 and 383: VAL functionFunctionSyntaxRemarksSe
Page 386 and 387: VIEW statementFunctionSyntaxRemarks
Page 388 and 389: WAlT statementFunctionSyntaxRemarks
Page 390 and 391: Example I set the value of I to 0I
Page 392 and 393: Example, set to medium resolution g
Page 394 and 395: See Alsocreates a 4 trillion point
Page 396 and 397: WRITE statementFunctionSyntaxRemark
Page 398 and 399: A p p E N o x ANumeric Consideratio
Page 400 and 401: And -531 decimal equals two's compl
Page 402 and 403: Increasing SignificanceWord '-1 S-I
Page 404 and 405: A p p E N D x BEvent TrappingTurbo
Page 406 and 407: DispHelpText:oldcsrx = POS(O) : old
Page 408 and 409: A p p E N o x cAssembly Language In
Page 410 and 411: The CALL INTERRUPT StatementThe CAL
Page 412 and 413: As an example, function FNFreeSpace
Page 414 and 415: 4,5: Number of elements in the arra
Page 416 and 417: INLINE Assembly ExampleSuppose you
Page 418 and 419: A p p E N D x DComparing Turbo Basi
Page 420 and 421: MOTORThe cassette port has not prov
Page 422 and 423: Structured StatementsIn an enhancem
Page 424 and 425: Compiler ImplementationCompiler imp
Page 426 and 427: A p p E N D x EError MessagesThere
Page 428 and 429: • Trying to perform invalid mathe
Page 430 and 431: 62 Input past endYou tried to read
Page 432 and 433: 403 $IF nesting overflow·Condition
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428 Numeric scalar variable expecte
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453 Undefined name constantYou used
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476 CLEAR parameter error - use MEM
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499 Destination file write errorWhi
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A p p E N D x FReference MaterialsT
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Extended Key CodesExtended key code
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Table F-3 Keyboard Scan CodesKey Sc
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A p p E N D x GA DOS PrimerIf you a
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There's one thing you need to remem
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"Where Am If The $p $g PromptYou pr
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• To move to the root directory:
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A p p E N o x HSummary of Functions
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Error HandlingERADRERDEV/ERRDEV$ERL
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GraphicsCIRCLEDRAWLINEPAINTPEEKPEN
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Metastatements$COM$DYNAMIC$EVENT$IF
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ScreenCLSCOLORCOLORCSRLINLOCATEPOSS
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A p p E N D x ICustomizing Turho Ba
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Once you press Enter to modify a ke
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Color Display ModeTurbo Basic will
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Index457
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CHR$ function, 148and ASC, 131and P
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GGET statement (files), 106, 108, 1
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ON COM(n) statement, 270ON ERROR st
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Statements, 59-60Static arrays, 76a
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BorlandSoftwareINTERNATIONAL 4585 S
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The Organizer For The Computer Age!
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1 : 'rl'~ _AIASEIThe high-performan
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If you use an IBM® PC, you needT U
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Version 3.0 with 8081 support and B
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nIRBO PASCAl.DATARJlSE100tsox®Is T
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mRBOPASCAl..EDJ2OR 2t:ol,BOX®It's
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GAM.EWo.Rrcs®~.2VR80,PASCA£' ,Sec
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"'" ",,,,,D.-Enhances Turbo Prolog
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Includes treeMicroCalc spreadsheetw
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l,rIIEl; 111 IA1AIA"~rj • • AIA
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BorlandSoftwareOBDBll fODAY_______j
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YOUNprobably know us for our Turbo
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