4. Error Messages

Summarized list of possible DOS error messages and their probable causes.

?DIRECTORY FULL

An attempt was made to save a program
or a file on the floppy disk whose directory
already contains 120 entries.

?DISK BUFFER FULL

An attempt was made to open a file with
OPEN, although two files are already open.

?DISK FULL

There is no more free sector on the floppy disk.

?DISK I/O ERROR

An error occurred while writing or reading.
e.g. address stamp not found; checksum
wrong etc.

?DISK WRITE PROTECTED

An attempt was made to write to a floppy
disk with the write-protect notch taped over.

?FILE ALREADY EXISTS

A program to be stored on the diskette is
already there.

?FILE ALREADY OPEN

An OPEN call was issued to a file that is
already open.

?FILE NOT FOUND

A file addressed for reading or a program to
be loaded is not present on the diskette.

?FILE NOT OPEN

An attempt was made to use ІN# or PR# to
change a file that has not previously been
opened.|br|

?FILE TYPE MISMATCH

An attempt was made to access a file
with the wrong type.
LOAD/RUN - file type not equal to “Т”
BLOAD/BRUN - file type not equal to “B”
OPEN - file type not equal to “D”
DCOPY - file type equal to “D”

?ILLEGAL DIRECT

An attempt was made to use a DCOPY
command in program mode, or an OPEN, IN#,
or PR# command in direct mode.|br|

?ILLEGAL READ

The IN# command was issued for a file
that is open for writing.

?ILLEGAL WRITE

The PR# command was issued for a file
that is open for reading.

?INSUFFICIENT MEMORY FOR DOS

An attempt was made to initialize the
DOS system on a LASER 110 or VZ200
without memory expansion.