I/O Errors are identified as codes 1 thru 199 and are equivalent
       to the error codes reported by DOS.  These errors occur when
       programs incorrectly access the input/output devices. I/O errors
       can be effectively trapped by first turning off error detection
       {$I-}, performing an I/O operation, and reading the status of the
       operation with IOResult.  IOResult will display a value of 0 is
       the operation was successful and a non-zero value otherwise.


       ERROR NUMBER                        ERROR MESSAGE
   -------------------------------------------------------------------------

    2. File Not Found               The name assigned to a file variable
                                    was not found during a call to Append,
                                    Erase, Reset, ReWrite, or ReName.

    3. Path Not Found               This error is reported if a specified
                                    path cannot be found.

    4. Too Many Open Files          You have tryed to open more files
                                    than allowed by DOS.
                                    a. You may has forgotten to close a
                                       file or are using a function to
                                       check to see if a file exists that
                                       does not close a file if it exists.
                                    b. Increase the number of file located
                                       your CONFIG.SYS file.

    5. File Access Denied           Occurs if you are trying to access a
                                    file or directory that
                                    a. is Read-Only
                                    b. is Not open for output
                                    c. does not have sufficient room on
                                       the disk.
                                    d. is Not open for reading.

    6. Invalid File Handle          The file variable that you assigned to
                                    a filename has somehow been lost or
                                    corrupted.

   12. Invalid File Access Code     Reported by Reset or Append on a typed
                                    file if the value of the FileMode is
                                    invalid.

   15. Invalid Drive Number         The specified drive was not found.

   16. Cannot Remove Current
       Directory                    It is invalid to remove the same
                                    directory you are in.

   17. Cannot Rename Across Drives  Occurs if you pass to files to rename
                                    that both are one the same drive.

  100. Disk Read Error              You attempted to read past the end
                                    of a typed file.

  101. Disk Write Error             The disk is full.

  102. File Not Assigned            The filename has not been assigned to
                                    a file variable.

  103. File Not Open                The file has not been opened prior to
                                    a call to BlockRead, BlockWrite, Close,
                                    Eof, FileSize, FilePos, Flush, Read,
                                    Seek, or Write.

  104. File Not Open For Input      A file has not been open prior to a
                                    call to a text file operation.

  105. File Not Open For Output     A file has not been open prior to a
                                    call to a text file operation.

  106. Invalid Numeric Format       A numeric value read from a text file
                                    does not conform to the proper numeric
                                    format.