APPENDIX A

BASIC LANGUAGE ERROR MESSAGES

The following error messages are displayed by BASIC. Error messages can also be displayed with the use of the ERR$() function. The error numbers below refer only to the number assigned to the error for use with the ERR$() function.

ERROR#	ERROR NAME	DESCRIPTION
1	TOO MANY FILES	There is a limit of 10 files OPEN at one time.
2	FILE OPEN	An attempt was made to open a file using the number of an already open file.
3	FILE NOT OPEN	The file number specified in an I/O statement must be opened before use.
4	FILE NOT FOUND	Either no file with that name exists (disk) or an end-of-tape marker was read (tape).
5	DEVICE NOT PRESENT	The required I/O device is not available or buffers deallocated (cassette). Check to make sure the device is connected and turned on.
6	NOT INPUT FILE	An attempt was made to GET or INPUT data from a file that was specified as output only.
7	NOT OUTPUT FILE	An attempt was made to send data to a file that was specified as input only.
8	MISSING FILE NAME	File name missing in command.
9	ILLEGAL DEVICE NUMBER	An attempt was made to use a device improperly (SAVE to the screen, etc.).
10	NEXT WITHOUT FOR	Either loops are nested incorrectly, or there is a variable name in a NEXT statement that doesn't correspond with one in FOR.
11	SYNTAX	A statement not recognized by BASIC. This could be because of a missing or extra parenthesis, misspelled key word, etc.
12	RETURN WITHOUT GOSUB	A RETURN statement was encountered when no GOSUB statement was active.
13	OUT OF DATA	A READ statement was encountered without data left unREAD.
14	ILLEGAL QUANTITY	A number used as the argument of a function or statement is outside the allowable range.
15	OVERFLOW	The result of a computation is larger than the largest number allowed (1.701411833E+38).
16	OUT OF MEMORY	Either there is no more room for program code and/or program variables, or there are too many nested DO, FOR or GOSUB statements in effect.
17	UNDEF'D STATEMENT	A line number referenced doesn't exist in the program.
18	BAD SUBSCRIPT	The program tried to reference an element of an array out of the range specified by the DIM statement.
19	REDIM'D ARRAY	An array can only be DIMensioned once.
20	DIVISION BY ZERO	Division by zero is not allowed.
21	ILLEGAL DIRECT	INPUT or GET, or INPUT# or GET# statements are only allowed within a program.
22	TYPE MISMATCH	This occurs when a numeric value is used in place of a string or vice versa.
23	STRING TOO LONG	A string can contain up to 255 characters.
24	FILE DATA	Bad data read from a tape or disk file.
25	FORMULA TOO COMPLEX	The computer was unable to understand this expression. Simplify the expression (break into two parts or use fewer parentheses).
26	CAN'T CONTINUE	The CONT command does not work if the program was not RUN, there was an error, or a line had been edited.
27	UNDEFINED FUNCTION	A user-defined function was referenced that was never defined.
28	VERIFY	The program on tape or disk does not match the program in memory.
29	LOAD	There was a problem loading. Try again.
30	BREAK	The stop key was hit to halt program execution.
31	CAN'T RESUME	A RESUME statement was encountered without a TRAP statement in effect.
32	LOOP NOT FOUND	The program has encountered a DO statement and cannot find the corresponding LOOP.
33	LOOP WITHOUT DO	LOOP was encountered without a DO statement active.
34	DIRECT MODE ONLY	This command is allowed only in direct mode, not from a program.
35	NO GRAPHICS AREA	A command (DRAW, BOX, etc.) to create graphics was encountered before the GRAPHIC command was executed.
36	BAD DISK	An attempt failed to HEADER a diskette, because the quick header method (no ID) was attempted on a unformatted diskette or the diskette is bad.
37	BEND NOT FOUND	The program encountered an "IF... THEN BEGIN" or "IF... THEN... ELSE BEGIN" construct, and could not find a BEND keyword to match the BEGIN.
38	LINE # TOO LARGE	An error has occurred in renumbering a BASIC program. The given parameters result in a line number > 63999 being generated; therefore, the renumbering was not performed.
39	UNRESOLVED REFERENCE	An error has occurred in renumbering a BASIC program. A line number referred to by a command (e.g., GOTO 999) does not exist. Therefore the renumbering was not performed.
40	UNIMPLEMENTED COMMAND	A command not supported by BASIC 7.0 was encountered.
41	FILE READ	An error condition was encountered while loading or reading a program or file from the disk drive (e.g., opening the disk drive door while a program was loading).