These commands are the core of BEAV. These commands allow the buffer to be edited in a similar fashion to a text editor. BEAV has an insert mode much the same as text editors but it only works when displaying data in one of the text modes, either ASCII or EBCDIC. In other modes it doesn't make any sense to insert characters as they are typed when there is more than one characters per unit. In the data modes there is a command that inserts a unit of zeros into the buffer. Similarly the delete commands always delete a unit rather than a character. In a text mode the delete commands work as in a text editor because a unit is a character.
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Ctl-X I insert-unit
Insert a zero at the cursor position. The rest of the data moves down one place. Thus, if double words are being displayed, four bytes are inserted before the cursor position. These bytes are initialized to zero. This command works in all display modes.
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Ctl-X Ctl-A insert-toggle Insert
In either of the two text modes this command toggles between insert mode and overwrite mode. In insert mode each character that is typed is inserted in front of the cursor and the rest of the buffer is moved down. In overwrite mode the typed characters replace the character that is at the cursor. This command has no effect in a non-text display mode.
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Ctl-Q insert-literally Esc Q
This command sets a special temporary mode where the next typed character is inserted in the buffer no matter what the character is. This allows control codes to be inserted in the buffer when in a text display mode. Alternatively the same byte could be inserted into the buffer by using one of the data display modes. It night be faster to use this command on some occasions.
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Ctl-T unit-twiddle
The unit at the cursor is swapped with the previous unit.
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Rubout delete-back-char Backspace
This command deletes the character before the cursor and pulls the rest of the buffer back. The cursor remains on the same character as it moves back. It only works in the text and byte display modes.
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Ctl-D delete-forw-char Delete
The character at the cursor is deleted and the buffer is pulled back. The cursor remains at the same position. It only works in the text and byte display modes.
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Esc Rubout delete-back-unit Esc Ctl-K
This command deletes the unit before the cursor and pulls the rest of the buffer back. The cursor remains on the same unit as it moves back.
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Esc D delete-forw-unit
The unit at the cursor is deleted and the buffer is pulled back. The cursor remains at the same position.
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Esc W copy-mark-to-cursor F7
The area in the buffer from the mark to the current cursor position is copied into the kill buffer. If the mark is not set before this command is given an error is reported.
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Ctl-W delete-mark-to-cursor F8
The area in the buffer from the mark to the current cursor position is deleted and placed into the kill buffer. If the mark is not set before this command is given an error is reported.
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Ctl-Y yank F6
The contents of the kill buffer is inserted into the buffer at the cursor position. The kill buffer itself is not changed.