020  Undefined file error
021  Typeahead buffer overflow
022  Window size too small
023  Cannot delete the only window
024  Cannot link a window to itself
025  Word too long for current margins
026  No block is defined
027  Block is not in a viewable window
028  Invalid marker number
029  Marker has not been set
030  Marker is not in a viewable window
031  Invalid margin specification
035  No more memory available
036  Invalid integer
037  Command aborted
038  Not found
039  Disk full
040  File too big! Partial file read
041  Line too long
001  File does not exist
002  File is not open for input
003  File is not open for output
004  File is not open
005  Read error or directory not found
006  Write error
016  Invalid numeric format
032  Not allowed on logical device
033  Not allowed in direct mode
034  Cannot assign to standard files
144  Record length mismatch
145  Cannot seek beyond end of file
153  Unexpected end of file
240  Disk write error occurred
241  Directory is full
242  File size overflow
255  File has disappeared
101  File creation error
102  Unable to close target file
103  Unable to close source file
104  Unable to create ".BAK" file
106  Program file not found
107  Error saving defaults
108  Printing error
111  Error reading print file
113  Error closing print file
114  Print file not found
120  Maximum of two windows allowed
121  Second window not open
122  Invalid directory path
123  RAM dictionary not resident
200  Not enough memory to reform paragraph
201  Cannot find RAM dictionary
202  Cannot find MAIN dictionary
203  Not enough memory to load RAM dictionary
204  Not enough memory to load MAIN dictionary
205  Cannot find USER dictionary
206  A critical I/O error occurred