IBM 4400 manual NUL Code, CR Edit Mode Example Enter in Print Buffer Printed Result, Key

Edit Mode

Edit Mode

Any printable character in the data stream can replace printable characters or spaces already loaded in the print buffer. The space character (hex 20) is used to skip characters in the print buffer that are not to be replaced and, similar to underlining or deleting, the new characters are inserted in the appropriate positions. Table 13 illustrates the edit mode. Note that the editing function replaces characters; it cannot be used to print the same character twice (double strike) in the same location. Use the DEL code (hex 7F) to make a character blank.

NOTE: In order for edit mode to work correctly, the protocol must be configured for a carriage return only. If configured for a carriage return and a line feed, the contents of the buffer are printed upon receipt of the CR code, disabling the editing function.

Table 13. CR Edit Mode Example

	Enter in Print Buffer	Printed Result
Example 1	AAABBBCCC(CR)	AAABDBCCB
	SSSSDSSSB(LF)
Example 2	ABCDEF(CR)	ABCDEF
	______(CR)
Key:	S = Space (hex 20);
	LF = Line Feed (hex 0A);
	CR = Carriage Return (hex 0D)

NUL Code

NUL (hex 00) is ignored by the printer and can be used as a fill character; however, it can not be used to add blank spaces since it is not a space character.

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