Warning Messages - Texas Instruments 990 Operation Manual

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4.6.2 WARNING MESSAGES. When any command that operates on data in the buffer is
entered before data has been placed in the buffer from the input file or from the keyboard
(either initially or after writing the entire buffer contents), PX9EDT prints the following
message:
BUFFER EMPTY
To recover, the user should enter a D command, or an I command and data.
When a D, I, or C command attempts to put more data into the buffer than the buffer can
contain, PX9EDT prints the following message:
BUFFER FULL!
The user must enter a K command to write data from the buffer before entering or reading any
more data.
When a D command attempts to read more records from the input file than the file contains,
PX9EDT prints the following message:
END OF FILE
PX9EDT will not make any further attempt to read the input file until the program restarts.
When the negative displacement from the pointer line in a C, M, R, F, or P command is greater
than the number of lines in the buffer ahead of the pointer line, PX9EDT prints the following
message:
OFF THE TOP
After printing the message, PX9EDT executes the command beginning with the top line of the
buffer.
When the positive displacement from the pointer line in a C, M, R, F, or P command is greater
than the number of lines in the buffer following the pointer line plus one, the command
executes normally until it has processed the last line in the buffer. PX9EDT then prints the
following message:
LAST LINE
PX9EDT prints a question mark and waits for another command.
When the first line in a C, M, R, F, or P command, or the line number in an I command, or the
destination line number in an M command is not in the buffer, PX9EDT prints the following
message:
LINE NOT FOUND
PX9EDT does not execute the command, but prints a question mark and waits for another
command.
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Digital Systems Division