fBASIC

Constant

• • PI (3.14159)

Variables

• • Variable names have to start with A-Z and range between 1E-39 and 1E38.

  • String variable names end with a $ e.g. TEXT$. The user has to supply the starting address of the string in the coresponding variable TEXT.

  • Only one dimensional arrays are possible. The number of elements in the array must be specified in a DIM statement. The user has to supply the starting address of the array in the memory in the coresponding variable.

  • e.g.: meas=#4100: DIM MEAS(20): MEAS(9)=542: PRINT MEAS(9)

Expressions

• • FREE returns the number of bytes left in the page

  • PAGE returns the current page number

  • RND returns a random number between 0 and 1

  • STAT returns the value of the INS8060 Status Register

  • TOP returns the highest address of the NIBL program in the current page

Program entry

• • AUTO n generates line numbers starting at number n (ctrl c to quit)

  • AUTO n,m generates line numbers starting at n with increment m (ctrl c to quit)

  • BYE quit floating point basic

  • EDIT n allows for editing of line n. Characters may be inserted with cntrl Q and deleted with cntrl X, cntrl C will exit EDIT

  • LINK x link with user routine

  • LIST

  • LIST n

  • LIST n-m

  • NEW

  • NEW x

Decleration Statements

• • CLEAR clears all variables and stacks

  • DATA

  • DEF FN

  • DIM

  • LET

DEF FN must be followed by a character A-Z, so 26 user defined functions are possible. An expression between brackets can be added to transfer a parameter e.g.: DEF FNA (SQROOT) = SQR(SQROOT) INPUT A PRINT FNA(A): REM prints square root of A

DEF FNB = SIN(X)+1 INPUT X PRINT FNB

Program Flow Control

• • DO / UNTIL

  • END

  • FOR / NEXT / STEP

  • GOTO

  • GOSUB / RETURN

  • ON ... GOSUB / GOTO

  • IF ... THEN ...: ELSE

  • IF ... THEN n: ELSE

  • IF ...: ELSE

  • READ

  • RESTORE

  • RESTORE n

Numeric functions

Floating point numbers have to be between 10E-39 and 10E38. Maximal nesting of 5 brackets. Numbers larger than 8.388.607 have to be entered in exponantial form. Normal accuracy is 6 digits.

• • + - / * **

  • DIV

  • MOD

  • ABS

  • SQR

  • ATN

  • SIN

  • COS

  • TAN

  • INT

  • LB logarithm on base 2

  • LG logarithm on base 10

  • LN logaritm on e

  • EXP

  • SGN

Logical Operators

• • AND

  • EXOR

  • NOT

  • OR

Relational Operators

• • =

  • <>

  • >=

  • <=

  • >

  • <

String Functions

• • ASC

  • LEN

  • VAL

  • CHR$

  • LEFT$

  • MID$

  • RIGHT$

  • STR$

String Concatination &

e.g. VAR = TOP: VAR1 = TOP + 72 VAR1$ = "123456": VAR$ = RIGHT$(VAR1$,2)&CHR$(65)&"LT"&MID$(VAR1$,2,3) PRINT VAR$

String Comparisment

• • IF var$ = "string" ...

  • IF var1$ = var2$ ...

Input/Output

• • INPUT "string" ...

  • INPUT ...

  • PRINT

  • PR

  • TAB(x)

  • SPC(x)

  • VERT(x)

  • VERT(-x)

  • PEEK

  • POKE

  • #DFC1 (hexadecimal number)