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BASIC Statements


BASIC Statements

CLEARn Reserves n bytes of string storage space (0-3142). Initializes all variables.

CLEAR     CLEAR 75     CLEAR O
 

CLOAD Loads a BASIC program file from cassette. Only the first 8 characters of the file name are used. An optional name may be specified.

CLOAD     CLOAD "MIXIT"
 

CLOAD* Loads numeric data into an array from cassette file which has been created using CSAVE*. Array name must be specified.

CLOAD*G,"TOMFILE"
 

CLOADM Loads a machine language program file from cassette. Only the first 8 characters of the file name are used. An optional name or offset may be specified.

CLOADM     CLOADM "DEBUG"     CLOADM "DEBUG",1024
 

CLS(c) Clears the display to the color (c) specified. if c is omitted, green is used.

Colors:

0-all colors off (black) 

1-green 

2-yellow

3-blue 

4-red

5-buff 

6-cyan

7-magenta 

8-orange

 

CONT Continues execution of program after [BREAK] or STOP.

CONT

 

CSAVE Stores resident program on cassette tape. Only the first 8 characters of the file name are used.

CSAVE       CSAVE "MIXIT"
 

CSAVE* Saves the contents of a numeric array on cassette tape for later use by CLOAD*. Array name must be specified.

CSAVE*G, "ASHER"

 

DATA Stores data to be accessed by a READ statement.

DATA "LINCOLN, A", 1861, ILLINOIS
 

DIM Dimensions one or more arrays.

DIM R(65), W(40)      DIM AR$(8,25)
DIM L(3,18,5)

 

END Ends program execution.

END

EXEC Executes machine language. Address is not required after a CLOADM.

EXEC       EXEC 2345

 

FOR ... TO ... STEP/NEXT Opens program loop.

FOR I = 1 to 8 (...) NEXT I
FOR C = 0 to 5 STEP 2 (...) NEXT C

 

GOSUB Transfers program control to the specified subroutine.

GOSUB 750

 

GOTO Transfers program control to the specified line.

GOTO 180
 

IF ... THEN Tests conditional expression.

IF P = 0 THEN 200
IF N = 3 THEN GOSUB 500
 

INPUT Inputs data from the keyboard.

INPUT X        INPUT L,M,N      INPUT "NEXT"; N

 

LIST Lists program lines to the video display.

LIST        LIST 50-85

 

LLIST Lists program lines to the line printer.

LLIST         LLIST 50-

 

LPRINT Prints an item or list of items on the printer.

LPRINT "TESTl"

 

NEW Erases program from memory; initializes all variables.

NEW

 

OFF Reserved but unused.

 

ON ... GOSUB Multi-way branch to specified subroutines.

ON V GOSUB 50, 100, 150, 200

 

ON ... GOTO Multi-way branch to specified lines.

ON X GOTO 190, 200, 210

 

POKE Puts a value into a memory location

POKE X, Y      POKE 23456,123

 

PRINT Prints an item or list of items on the display at current cursor position.

PRINT X + Y      PRINT "U.S.A."

 

PRINT@n Prints beginning at n, n = 0-511.

PRINT @238, "CENTER"

 

PRINT TAB Moves the cursor to specified column position.

PRINT TAB(5) "NAME"

 

READ Reads value(s) from a DATA statement.

READ T         READ S$       READ NM$, AGE

 

REM Remark; instructs computer to ignore rest of line.

REM PLACE COMMENTS HERE

 

RESET(x,y) Turns off graphics block at specified location.

x(horizontal) = 0-63. y(vertical) = 0-31

RESET(21,30)      RESET(L1,L2)

 

RESTORE Resets data pointer to first item in the first data line.

RESTORE

 

RETURN Returns from subroutine to next statement after GOSUB.

RETURN

 

RUN Executes resident program or portion of it.

RUN       RUN 150

 

SET(x,y,c) Turns on graphics cell to specified color (C) at specified locations x(horizontal) = 0-63; y(vertical) = 0-31. See CLS for colors. If c = 0 cell is unchanged or set green (if in character mode.)

SET(10,0,1)      SET(L1,L2,C)

 

SKIPF Positions cassette tape at end of next file.

SKIPF"PROGRAM" SKIPF

 

SOUND (f,d) Sounds the frequency (f 1-255) and duration (d = 1-255)specified.

SOUND 1, 200       SOUND 128, 5

 

STOP Stops execution of a program.

STOP