bwBASIC/DOCS/PDP-11.txt

============================================================
                    GENERAL                                 
============================================================


OPTION VERSION "PDP-11"
REM INTERNAL ID: D70
REM DESCRIPTION: DEC PDP-11 BASIC
REM   REFERENCE: PDP-11 BASIC Programming Manual
REM              by Digital Equipement Corporation
REM              (c) 1970, Digital Equipement Corporation
REM              http://bitsavers.trailing-edge.com/pdf/dec/pdp11/basic/
REM              DEC-11-AJPB-D_PDP-11_BASIC_Programming_Manual_Dec70.pdf
REM
OPTION STRICT OFF
OPTION ANGLE RADIANS
OPTION BUGS ON
OPTION LABELS OFF
OPTION COMPARE BINARY
OPTION COVERAGE OFF
OPTION TRACE OFF
OPTION ERROR GOTO
OPTION IMPLICIT
OPTION BASE          0
OPTION RECLEN        128
OPTION DATE          ""
OPTION TIME          ""
OPTION PUNCT STRING        "$"
OPTION PUNCT DOUBLE        "#"
OPTION PUNCT SINGLE        "!"
OPTION PUNCT CURRENCY      " "
OPTION PUNCT LONG          "&"
OPTION PUNCT INTEGER       "%"
OPTION PUNCT BYTE          " "
OPTION PUNCT QUOTE         """
OPTION PUNCT COMMENT       " "
OPTION PUNCT STATEMENT     ":"
OPTION PUNCT PRINT         " "
OPTION PUNCT INPUT         " "
OPTION PUNCT IMAGE         " "
OPTION PUNCT LPAREN        "("
OPTION PUNCT RPAREN        ")"
OPTION PUNCT FILENUM       "#"
OPTION PUNCT AT            " "
OPTION USING DIGIT   "#"
OPTION USING COMMA   ","
OPTION USING PERIOD  "."
OPTION USING PLUS    "+"
OPTION USING MINUS   "-"
OPTION USING EXRAD   "^"
OPTION USING DOLLAR  "$"
OPTION USING FILLER  "*"
OPTION USING LITERAL "_"
OPTION USING FIRST   "!"
OPTION USING ALL     "&"
OPTION USING LENGTH  "\"


============================================================
                    COMMANDS                                
============================================================


------------------------------------------------------------
     SYNTAX: BYE
DESCRIPTION: Exits to the operating system.
------------------------------------------------------------
     SYNTAX: DATA constant [, ...]
DESCRIPTION: Stores numeric and string constants to be
             accessed by READ.
------------------------------------------------------------
     SYNTAX: DEF FNname[( arg [,...] )] = value
DESCRIPTION: Defines a single-line function.  Single-line
             functions require an equal sign.
------------------------------------------------------------
     SYNTAX: DEF FNname[( arg [,...] )]
DESCRIPTION: Defines a multiline function.  Multi-line DEF
             functions do not have an equal sign and must
             end with FNEND.
------------------------------------------------------------
     SYNTAX: DELETE line [- line]
DESCRIPTION: Deletes program lines indicated by the
             argument(s).  All program lines have a
             number, which is visible with the LIST
             command.  If line numbers are not provided,
             they are assigned beginning with 1.  Deleting
             a non-existing line does not cause an error.
------------------------------------------------------------
     SYNTAX: DIM [# filenum,] variable([ lower TO ] upper)
DESCRIPTION: Declares variables and specifies the
             dimensions of array variables.  For array
             variables, if the lower bound is not
             provided, then the OPTION BASE value is used.
             If filenum is provided, then the variable is
             virtual.
------------------------------------------------------------
     SYNTAX: ELSE
DESCRIPTION: Introduces a default condition in a multi-line
             IF statement.
------------------------------------------------------------
     SYNTAX: ELSEIF
DESCRIPTION: Introduces a secondary condition in a
             multi-line IF statement.
------------------------------------------------------------
     SYNTAX: END
DESCRIPTION: Terminates program execution. If the BASIC
             program was executed from the operating
             system level, then control returns to the
             operating system, oterwise control reuturns
             to the BASIC prompt.
------------------------------------------------------------
     SYNTAX: END IF
DESCRIPTION: Specifies the last line of a multi-line IF
             definition.
------------------------------------------------------------
     SYNTAX: FNEND
DESCRIPTION: Specifies the last line of a multi-line DEF
             function.
------------------------------------------------------------
     SYNTAX: FOR variable = start TO finish [STEP
             increment]
DESCRIPTION: Top of a FOR - NEXT structure.  The loop will
             continue a fixed number of times, which is
             determined by the values of start, finish,
             and increment.
------------------------------------------------------------
     SYNTAX: GO
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: GO SUB line
DESCRIPTION: Initiates a subroutine call to the line
             specified.  The subroutine must end with
             RETURN.  The line may be a number or a label.
------------------------------------------------------------
     SYNTAX: GO TO line
DESCRIPTION: Branches program execution to the specified
             line.  The line may be a number or a label.
------------------------------------------------------------
     SYNTAX: GOSUB line
DESCRIPTION: Initiates a subroutine call to the line
             specified.  The subroutine must end with
             RETURN.  The line may be a number or a label.
------------------------------------------------------------
     SYNTAX: GOTO line
DESCRIPTION: Branches program execution to the specified
             line.  The line may be a number or a label.
------------------------------------------------------------
     SYNTAX: IF value THEN line1 [ELSE line2]
DESCRIPTION: Single line standard IF command.  If the value
             is non-zero, then branh to line1.  If the
             value is zero and ELSE is provided, then
             branch to line2.  Otherwise continue to the
             next line.  LABELS are not allowed.
------------------------------------------------------------
     SYNTAX: IF value THEN
DESCRIPTION: Top of a multi-line IF - END IF structure.  If
             the value is non-zero, then the program lines
             upto the next ELSE or ELSE IF command are
             executed, otherwise the program branches to
             the next ELSE or ELSE IF command.
------------------------------------------------------------
     SYNTAX: INPUT "prompt string" , variable [, ...]
DESCRIPTION: Reads input from the terminal after displaying
             a prompt.
------------------------------------------------------------
     SYNTAX: INPUT # filenum , variable [, ...]s
DESCRIPTION: Reads input from the file specified by
             filenum.
------------------------------------------------------------
     SYNTAX: INPUT variable [, ...]
DESCRIPTION: Reads input from the terminal.
------------------------------------------------------------
     SYNTAX: [LET] variable [, ...] = value
DESCRIPTION: Assigns the value to the variable.  The LET
             keyword is optional.
------------------------------------------------------------
     SYNTAX: LIST line1 [- line2]
DESCRIPTION: Lists BASIC program lines from line1 to line2
             to the console on stdout.
------------------------------------------------------------
     SYNTAX: MAINTAINER
DESCRIPTION: This command is reserved for use by the
             Bywater BASIC maintainer.  It is not for the
             BASIC programmer.
------------------------------------------------------------
     SYNTAX: MAINTAINER CMDS
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: MAINTAINER CMDS HTML
DESCRIPTION: Dump COMMAND vs VERSION as HTML table
------------------------------------------------------------
     SYNTAX: MAINTAINER CMDS ID
DESCRIPTION: Dump COMMAND #define.
------------------------------------------------------------
     SYNTAX: MAINTAINER CMDS MANUAL
DESCRIPTION: Dump COMMAND manual.
------------------------------------------------------------
     SYNTAX: MAINTAINER CMDS_SWITCH
DESCRIPTION: Dump COMMAND switch.
------------------------------------------------------------
     SYNTAX: MAINTAINER CMDS TABLE
DESCRIPTION: Dump COMMAND table.
------------------------------------------------------------
     SYNTAX: MAINTAINER DEBUG
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: MAINTAINER DEBUG OFF
DESCRIPTION: Disable degug tracing.
------------------------------------------------------------
     SYNTAX: MAINTAINER DEBUG ON
DESCRIPTION: Enable degug tracing.
------------------------------------------------------------
     SYNTAX: MAINTAINER FNCS
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: MAINTAINER FNCS HTML
DESCRIPTION: Dump FUNCTION vs VERSION as HTML table.
------------------------------------------------------------
     SYNTAX: MAINTAINER FNCS ID
DESCRIPTION: Dump FUNCTION #define.
------------------------------------------------------------
     SYNTAX: MAINTAINER FNCS MANUAL
DESCRIPTION: Dump FUNCTION manual.
------------------------------------------------------------
     SYNTAX: MAINTAINER FNCS SWITCH
DESCRIPTION: Dump FUNCTION switch.
------------------------------------------------------------
     SYNTAX: MAINTAINER FNCS TABLE
DESCRIPTION: Dump FUNCTION table.
------------------------------------------------------------
     SYNTAX: MAINTAINER MANUAL
DESCRIPTION: Dump manual for the currently selected OPTION
             VERSION.
------------------------------------------------------------
     SYNTAX: MAINTAINER STACK
DESCRIPTION: Dump the BASIC stack.
------------------------------------------------------------
     SYNTAX: NEW
DESCRIPTION: Deletes the program in memory and clears all
             variables.
------------------------------------------------------------
     SYNTAX: NEXT [variable]
DESCRIPTION: The bottom line of a FOR - NEXT structure.
------------------------------------------------------------
     SYNTAX: OLD [filename$]
DESCRIPTION: Loads an ASCII BASIC program into memory.
------------------------------------------------------------
     SYNTAX: OPTION
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: OPTION ANGLE
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: OPTION ANGLE DEGREES
DESCRIPTION: Configures these math functions to accept and
             return angles in degrees:  ACOS, ACS, ANGLE,
             ARCSIN, ASIN, ASN, ARCTAN, ATN, ATAN, COS,
             COT, CSC, SEC, SIN and TAN.
------------------------------------------------------------
     SYNTAX: OPTION ANGLE GRADIANS
DESCRIPTION: Configures these math functions to accept and
             return angles in gradians:  ACOS, ANGLE,
             ASIN, ASN, ATN, ATAN, COS, COT, CSC, SEC, SIN
             and TAN.
------------------------------------------------------------
     SYNTAX: OPTION ANGLE RADIANS
DESCRIPTION: Configures these math functions to accept and
             return angles in radians:  ACOS, ANGLE, ASIN,
             ASN, ATN, ATAN, COS, COT, CSC, SEC, SIN and
             TAN.
------------------------------------------------------------
     SYNTAX: OPTION ARITHMETIC
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: OPTION ARITHMETIC DECIMAL
DESCRIPTION: Currently has no effect.
------------------------------------------------------------
     SYNTAX: OPTION ARITHMETIC FIXED
DESCRIPTION: Currently has no effect.
------------------------------------------------------------
     SYNTAX: OPTION ARITHMETIC NATIVE
DESCRIPTION: Currently has no effect.
------------------------------------------------------------
     SYNTAX: OPTION BASE integer
DESCRIPTION: Sets the default lowest array subscript.
------------------------------------------------------------
     SYNTAX: OPTION BUGS
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: OPTION BUGS BOOLEAN
DESCRIPTION: Boolean results are 1 or 0 instead of bitwise.
------------------------------------------------------------
     SYNTAX: OPTION BUGS OFF
DESCRIPTION: Disables bugs commonly found in many BASIC
             dialects.
------------------------------------------------------------
     SYNTAX: OPTION BUGS ON
DESCRIPTION: Enables bugs commonly found in many BASIC
             dialects.
------------------------------------------------------------
     SYNTAX: OPTION COMPARE
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: OPTION COMPARE BINARY
DESCRIPTION: Causes string comparisons to be
             case-sensitive.
------------------------------------------------------------
     SYNTAX: OPTION COMPARE DATABASE
DESCRIPTION: Causes string comparisons to be
             case-insensitive.
------------------------------------------------------------
     SYNTAX: OPTION COMPARE TEXT
DESCRIPTION: Causes string comparisons to be
             case-insensitive.
------------------------------------------------------------
     SYNTAX: OPTION COVERAGE
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: OPTION COVERAGE OFF
DESCRIPTION: Disables BASIC code coverage recording,
             displayed using the LIST command.
------------------------------------------------------------
     SYNTAX: OPTION COVERAGE ON
DESCRIPTION: Enables BASIC code coverage recording,
             displayed using the LIST command.
------------------------------------------------------------
     SYNTAX: OPTION DATE format$
DESCRIPTION: Sets the date format string used by C
             strftime() for DATE$.
------------------------------------------------------------
     SYNTAX: OPTION DIGITS integer
DESCRIPTION: Sets the number of significant digits for
             PRINT.  Setting the value to zero restores
             the default.
------------------------------------------------------------
     SYNTAX: OPTION DISABLE
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: OPTION DISABLE COMMAND name$
DESCRIPTION: Disables the specified BASIC command.
------------------------------------------------------------
     SYNTAX: OPTION DISABLE FUNCTION name$
DESCRIPTION: Disables the specified BASIC function.
------------------------------------------------------------
     SYNTAX: OPTION DISABLE OPERATOR name$
DESCRIPTION: Disables the specified BASIC operator.
------------------------------------------------------------
     SYNTAX: OPTION EDIT string$
DESCRIPTION: Sets the program name used by the EDIT
             command.
------------------------------------------------------------
     SYNTAX: OPTION ENABLE
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: OPTION ENABLE COMMAND name$
DESCRIPTION: Enables the specified BASIC command.
------------------------------------------------------------
     SYNTAX: OPTION ENABLE FUNCTION name$
DESCRIPTION: Enables the specified BASIC function.
------------------------------------------------------------
     SYNTAX: OPTION ENABLE OPERATOR name$
DESCRIPTION: Enables the specified BASIC operator.
------------------------------------------------------------
     SYNTAX: OPTION ERROR
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: OPTION ERROR GOSUB
DESCRIPTION: When an error occurs, GOSUB to the error
             handler.  The error handler exits with
             RETURN.
------------------------------------------------------------
     SYNTAX: OPTION ERROR GOTO
DESCRIPTION: When an error occurs, GOTO to the error
             handler.  The error handler exits with
             RESUME.
------------------------------------------------------------
     SYNTAX: OPTION EXPLICIT
DESCRIPTION: All variables must be declared using DIM.
------------------------------------------------------------
     SYNTAX: OPTION EXTENSION string$
DESCRIPTION: Sets the BASIC filename extension, commonly
             ".bas".
------------------------------------------------------------
     SYNTAX: OPTION FILES string$
DESCRIPTION: Sets the program name used by the FILES
             command.
------------------------------------------------------------
     SYNTAX: OPTION IMPLICIT
DESCRIPTION: Variables need not be declared using DIM,
             provided arrays have no more that 10
             elements.  This is the opposite of OPTION
             EXPLICIT, and is the default for all versions
             of BASIC.
------------------------------------------------------------
     SYNTAX: OPTION INDENT integer
DESCRIPTION: Sets indention level for LIST.  Zero means no
             indention.  Default is 2.
------------------------------------------------------------
     SYNTAX: OPTION LABELS
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: OPTION LABELS OFF
DESCRIPTION: Disables text labels.
------------------------------------------------------------
     SYNTAX: OPTION LABELS ON
DESCRIPTION: Enables text labels.
------------------------------------------------------------
     SYNTAX: OPTION PROMPT string$
DESCRIPTION: Sets the BASIC prompt.
------------------------------------------------------------
     SYNTAX: OPTION PUNCT
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: OPTION PUNCT AT char$
DESCRIPTION: Sets the PRINT AT character, commonly "@".
------------------------------------------------------------
     SYNTAX: OPTION PUNCT BYTE char$
DESCRIPTION: Sets the suffix character that indicates a
             variable is of type BYTE, commonly "~".
------------------------------------------------------------
     SYNTAX: OPTION PUNCT COMMENT char$
DESCRIPTION: Sets the shortcut COMMENT character.
------------------------------------------------------------
     SYNTAX: OPTION PUNCT CURRENCY char$
DESCRIPTION: Sets the suffix character that indicates a
             variable is of type CURRENCY, commonly "@".
------------------------------------------------------------
     SYNTAX: OPTION PUNCT DOUBLE char$
DESCRIPTION: Sets the suffix character that indicates a
             variable is of type DOUBLE, commonly "#".
------------------------------------------------------------
     SYNTAX: OPTION PUNCT FILENUM char$
DESCRIPTION: Sets the FILE NUMBER prefix character,
             commonly "#".
------------------------------------------------------------
     SYNTAX: OPTION PUNCT IMAGE char$
DESCRIPTION: Sets the shortcut IMAGE character, commonly
             ":".
------------------------------------------------------------
     SYNTAX: OPTION PUNCT INPUT char$
DESCRIPTION: Sets the shortcut INPUT character, commonly
             "!".
------------------------------------------------------------
     SYNTAX: OPTION PUNCT INTEGER char$
DESCRIPTION: Sets the suffix character that indicates a
             variable is of type INTEGER, commonly "%".
------------------------------------------------------------
     SYNTAX: OPTION PUNCT LONG char$
DESCRIPTION: Sets the suffix character that indicates a
             variable is of type LONG, commonly "&".
------------------------------------------------------------
     SYNTAX: OPTION PUNCT LPAREN char$
DESCRIPTION: Sets the LEFT PARENTHESIS character, commonly
             "(".
------------------------------------------------------------
     SYNTAX: OPTION PUNCT_PRINT char$
DESCRIPTION: Sets the shortcut PRINT character, commonly
             "?".
------------------------------------------------------------
     SYNTAX: OPTION PUNCT QUOTE char$
DESCRIPTION: Sets the QUOTE character, commonly """
------------------------------------------------------------
     SYNTAX: OPTION PUNCT RPAREN char$
DESCRIPTION: Sets the RIGHT PARENTHESIS character, commonly
             ")".
------------------------------------------------------------
     SYNTAX: OPTION PUNCT SINGLE char$
DESCRIPTION: Sets the suffix character that indicates a
             variable is of type SINGLE, commonly "!".
------------------------------------------------------------
     SYNTAX: OPTION PUNCT STATEMENT char$
DESCRIPTION: Sets the statement seperator character,
             commonly ":".
------------------------------------------------------------
     SYNTAX: OPTION PUNCT STRING char$
DESCRIPTION: Sets the suffix character that indicates a
             variable is of type STRING, commonly "$".
------------------------------------------------------------
     SYNTAX: OPTION RECLEN integer
DESCRIPTION: Sets the default RANDOM record length.
------------------------------------------------------------
     SYNTAX: OPTION RENUM string$
DESCRIPTION: Sets the program name used by the RENUM
             command.
------------------------------------------------------------
     SYNTAX: OPTION ROUND
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: OPTION ROUND BANK
DESCRIPTION: Round using the Banker rule.
------------------------------------------------------------
     SYNTAX: OPTION ROUND MATH
DESCRIPTION: Round using mathematical rules.
------------------------------------------------------------
     SYNTAX: OPTION ROUND TRUNCATE
DESCRIPTION: Round using truncation.
------------------------------------------------------------
     SYNTAX: OPTION SCALE integer
DESCRIPTION: Sets the number of digits to round after the
             decimal point for PRINT.  Setting the value
             to zero disables rounding.
------------------------------------------------------------
     SYNTAX: OPTION SLEEP double
DESCRIPTION: Sets multiplier for SLEEP and WAIT.  Zero
             means no waiting.  Default is 1.
------------------------------------------------------------
     SYNTAX: OPTION STDERR filename$
DESCRIPTION: Sets the file used for STDERR, which is used
             by LPRINT commands.
------------------------------------------------------------
     SYNTAX: OPTION STDIN filename$
DESCRIPTION: Sets the file used for STDIN, which is used by
             INPUT commands.
------------------------------------------------------------
     SYNTAX: OPTION STDOUT filename$
DESCRIPTION: Sets the file used for STDOUT, which is used
             by PRINT commands.
------------------------------------------------------------
     SYNTAX: OPTION STRICT
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: OPTION STRICT OFF
DESCRIPTION: Disables checking for implicit array creation
             without using the DIM command.
------------------------------------------------------------
     SYNTAX: OPTION STRICT ON
DESCRIPTION: Enables checking for implicit array creation
             without using the DIM command.
------------------------------------------------------------
     SYNTAX: OPTION TERMINAL
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: OPTION TERMINAL ADM
DESCRIPTION: Enables ADM-3A terminal control codes for CLS,
             COLOR, and LOCATE.
------------------------------------------------------------
     SYNTAX: OPTION TERMINAL ANSI
DESCRIPTION: Enables ANSI terminal control codes for CLS,
             COLOR, and LOCATE.
------------------------------------------------------------
     SYNTAX: OPTION TERMINAL NONE
DESCRIPTION: Disables terminal control codes for CLS,
             COLOR, and LOCATE.
------------------------------------------------------------
     SYNTAX: OPTION TIME format$
DESCRIPTION: Sets the time format string used by C
             strftime() for TIME$.
------------------------------------------------------------
     SYNTAX: OPTION TRACE
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: OPTION TRACE OFF
DESCRIPTION: Disables displaying a stack trace when an
             ERROR occurs.
------------------------------------------------------------
     SYNTAX: OPTION TRACE ON
DESCRIPTION: Enables displaying a stack trace when an ERROR
             occurs.
------------------------------------------------------------
     SYNTAX: OPTION USING
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: OPTION USING ALL char$
DESCRIPTION: Specifies the magic ALL character for the
             PRINT USING command.  A common value is "&".
------------------------------------------------------------
     SYNTAX: OPTION USING COMMA char$
DESCRIPTION: Specifies the magic COMMA character for the
             PRINT USING command.  A common value is ",".
------------------------------------------------------------
     SYNTAX: OPTION USING DIGIT char$
DESCRIPTION: Specifies the magic DIGIT character for the
             PRINT USING command.  A common value is "#".
------------------------------------------------------------
     SYNTAX: OPTION USING DOLLAR char$
DESCRIPTION: Specifies the magic DOLLAR character for the
             PRINT USING command.  A common value is "$".
------------------------------------------------------------
     SYNTAX: OPTION USING EXRAD char$
DESCRIPTION: Specifies the magic EXRAD character for the
             PRINT USING command.  A common value is "^".
------------------------------------------------------------
     SYNTAX: OPTION USING FILLER char$
DESCRIPTION: Specifies the magic FILLER character for the
             PRINT USING command.  A common value is "*".
------------------------------------------------------------
     SYNTAX: OPTION USING FIRST char$
DESCRIPTION: Specifies the magic FIRST character for the
             PRINT USING command.  A common value is "!".
------------------------------------------------------------
     SYNTAX: OPTION USING LENGTH char$
DESCRIPTION: Specifies the magic LENGTH character for the
             PRINT USING command.  A common value is "\".
------------------------------------------------------------
     SYNTAX: OPTION USING LITERAL char$
DESCRIPTION: Specifies the magic LITERAL character for the
             PRINT USING command.  A common value is "_".
------------------------------------------------------------
     SYNTAX: OPTION USING MINUS char$
DESCRIPTION: Specifies the magic MINUS character for the
             PRINT USING command.  A common value is "-".
------------------------------------------------------------
     SYNTAX: OPTION USING PERIOD char$
DESCRIPTION: Specifies the magic PERIOD character for the
             PRINT USING command.  A common value is ".".
------------------------------------------------------------
     SYNTAX: OPTION USING PLUS char$
DESCRIPTION: Specifies the magic PLUS character for the
             PRINT USING command.  A common value is "+".
------------------------------------------------------------
     SYNTAX: OPTION VERSION version$
DESCRIPTION: Selects a specific BASIC version, which is a
             combination of OPTION settings, commands,
             functions and operators.  If no version is
             specified, displays a list of the available
             versions.
------------------------------------------------------------
     SYNTAX: OPTION ZONE integer
DESCRIPTION: Sets the PRINT zone width.  Setting the value
             to zero restores the default.
------------------------------------------------------------
     SYNTAX: PRINT # filenum , [USING format$;] value ...
DESCRIPTION: Sends output to a file.
------------------------------------------------------------
     SYNTAX: PRINT [USING format$;] value ...
DESCRIPTION: Sends output to the screen.
------------------------------------------------------------
     SYNTAX: READ variable [, ...]
DESCRIPTION: Reads values from DATA statements.
------------------------------------------------------------
     SYNTAX: REM ...
DESCRIPTION: Remark.
------------------------------------------------------------
     SYNTAX: RESTORE [line]
DESCRIPTION: Resets the line used for the next READ
             statement.  line may be either a number or a
             label.
------------------------------------------------------------
     SYNTAX: RETURN
DESCRIPTION: Concludes a subroutine called by GOSUB.
------------------------------------------------------------
     SYNTAX: RUN filename$
DESCRIPTION: Loads a new BAASIC program and executes the
             program from the start.
------------------------------------------------------------
     SYNTAX: RUN line
DESCRIPTION: Executes the program in memory beginning at
             line.
------------------------------------------------------------
     SYNTAX: RUN
DESCRIPTION: Executes the program in memory from the start.
------------------------------------------------------------
     SYNTAX: SAVE [filename$]
DESCRIPTION: Saves the current program into the file
             filename$ in ASCII format.
------------------------------------------------------------
     SYNTAX: STEP
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: STOP
DESCRIPTION: Interrupts program execution and displays the
             line number of the STOP command.  For use
             when debugging BASIC programs.  Whether STOP
             issues a SIGINT signal is implementation
             defined.
------------------------------------------------------------
     SYNTAX: THEN
DESCRIPTION: Syntax Error.
------------------------------------------------------------
     SYNTAX: TO
DESCRIPTION: Syntax Error.
------------------------------------------------------------


============================================================
                    FUNCTIONS                               
============================================================


------------------------------------------------------------
     SYNTAX: N  = ABS( X )
  PARAMETER: X  is a number
DESCRIPTION: The absolute value of X.
------------------------------------------------------------
     SYNTAX: N  = ATN( X )
  PARAMETER: X  is a number
DESCRIPTION: The arctangent of X in radians, i.e. the angle
             whose tangent is X, where -PI/2 < ATN(X) <
             PI/2.
------------------------------------------------------------
     SYNTAX: N  = COS( X )
  PARAMETER: X  is a number
DESCRIPTION: The cosine of X, where X is in radians.
------------------------------------------------------------
     SYNTAX: N  = EXF( ... )
DESCRIPTION: Execute hardware program.  Causes ERROR 73.
------------------------------------------------------------
     SYNTAX: N  = EXP( X )
  PARAMETER: X  is a number
DESCRIPTION: The exponential value of X, i.e., the value of
             the base of natural logarithms (e = 2.71828)
             raised to the power of X;  if EXP(X) is less
             that machine infinitesimal, then its value
             shall be replaced with zero.
------------------------------------------------------------
     SYNTAX: N  = INT( X )
  PARAMETER: X  is a number
DESCRIPTION: The largest integer not greater than X; e.g.
             INT(1.3) = 1 and INT(-1.3) = 2.
------------------------------------------------------------
     SYNTAX: N  = LOG( X )
  PARAMETER: X  is a number, >  0
DESCRIPTION: The natural logarithm of X; X shall be greater
             than zero.
------------------------------------------------------------
     SYNTAX: N  = RANDOMIZE
DESCRIPTION: Seeds the pseudo-random number generator with
             TIME.
------------------------------------------------------------
     SYNTAX: N  = RND
DESCRIPTION: The next pseudo-random number in an
             implementation-defined sequence of
             pseudo-random numbers uniformly distributed
             in the range 0 <= RND < 1.
------------------------------------------------------------
     SYNTAX: N  = RND( X )
  PARAMETER: X  is a number
DESCRIPTION: Returns a pseudorandom number in the range
             [0,1].  The value of X is ignored.
------------------------------------------------------------
     SYNTAX: N  = SGN( X )
  PARAMETER: X  is a number
DESCRIPTION: The sign of X: -1 if X < 0, 0 if X = 0, and +1
             if X > 0.
------------------------------------------------------------
     SYNTAX: N  = SIN( X )
  PARAMETER: X  is a number
DESCRIPTION: The sine of X, where X is in radians.
------------------------------------------------------------
     SYNTAX: S$ = SPC( X )
  PARAMETER: X  is a number
DESCRIPTION: The string of X spaces.  Only for use within
             the PRINT command.
------------------------------------------------------------
     SYNTAX: N  = SQR( X )
  PARAMETER: X  is a number, >= 0
DESCRIPTION: The non-negative square root of X;  X shall be
             non-negative.
------------------------------------------------------------
     SYNTAX: S$ = TAB( X )
  PARAMETER: X  is a number
DESCRIPTION: The string required to advance to column X. 
             Only for use within the PRINT command.
------------------------------------------------------------
     SYNTAX: N  = TAN( X )
  PARAMETER: X  is a number
DESCRIPTION: The tangent of X, where X is in radians.
------------------------------------------------------------


============================================================
                    OPERATORS                               
============================================================


------------------------------------------------------------
     SYNTAX: X ** Y
DESCRIPTION: Exponential
 PRECEDENCE: 14
------------------------------------------------------------
     SYNTAX: X ^ Y
DESCRIPTION: Exponential
 PRECEDENCE: 14
------------------------------------------------------------
     SYNTAX: + X
DESCRIPTION: Posation
 PRECEDENCE: 13
------------------------------------------------------------
     SYNTAX: - X
DESCRIPTION: Negation
 PRECEDENCE: 13
------------------------------------------------------------
     SYNTAX: X * Y
DESCRIPTION: Multiplication
 PRECEDENCE: 12
------------------------------------------------------------
     SYNTAX: X / Y
DESCRIPTION: Division
 PRECEDENCE: 12
------------------------------------------------------------
     SYNTAX: X + Y
DESCRIPTION: Addition
 PRECEDENCE: 9
------------------------------------------------------------
     SYNTAX: X - Y
DESCRIPTION: Subtraction
 PRECEDENCE: 9
------------------------------------------------------------
     SYNTAX: X < Y
DESCRIPTION: Less than
 PRECEDENCE: 7
------------------------------------------------------------
     SYNTAX: X <= Y
DESCRIPTION: Less than or Equal
 PRECEDENCE: 7
------------------------------------------------------------
     SYNTAX: X <> Y
DESCRIPTION: Not Equal
 PRECEDENCE: 7
------------------------------------------------------------
     SYNTAX: X = Y
DESCRIPTION: Equal
 PRECEDENCE: 7
------------------------------------------------------------
     SYNTAX: X =< Y
DESCRIPTION: Less than or Equal
 PRECEDENCE: 7
------------------------------------------------------------
     SYNTAX: X => Y
DESCRIPTION: Greater than or Equal
 PRECEDENCE: 7
------------------------------------------------------------
     SYNTAX: X > Y
DESCRIPTION: Greater than
 PRECEDENCE: 7
------------------------------------------------------------
     SYNTAX: X >< Y
DESCRIPTION: Not Equal
 PRECEDENCE: 7
------------------------------------------------------------
     SYNTAX: X >= Y
DESCRIPTION: Greater than or Equal
 PRECEDENCE: 7
------------------------------------------------------------