LD	D,+00	Fetch the duration of the
		LD	E,(PIP)	keyboard click.
		LD	HL,+00C8	And the pitch.
		CALL	03B5,BEEPER	Now make the 'pip'.
		POP	AF	Restore the code.
		LD	HL,+0F38	Pre-load the machine stack
		PUSH	HL	with the address of ED-LOOP.

Now analyse the code obtained.

		CP	+18	Accept all character codes,
		JR	NC,0F81,ADD-CHAR	graphic codes and tokens.
		CP	+07	Also accept ','.
		JR	C,0F81,ADD-CHAR
		CP	+10	Jump forward if the code
		JR	C,0F92,ED-KEYS	represents an editing key.

The control keys - INK to TAB -are now considered.

		LD	BC,+0002	INK & PAPER will require
				two locations.
		LD	D,A	Copy the code to 0.
		CP	+16	Jump forward with INK &
		JR	C,0F6C,ED-CONTR	PAPER'

AT & TAB would be handled as follows:

		INC	BC	Three locations required.
		BIT	7,(FLAGX)	Jump forward unless dealing
		JP	Z,101E,ED-IGNORE	with INPUT LINE... .
		CALL	15D4,WAIT-KEY	Get the second code.
		LD	E,A	and put it in E.

The other bytes for the control characters are now fetched.

0F6C	ED-CONTR	CALL	15D4,WAIT-KEY	Get another code.
		PUSH	DE	Save the previous codes.
		LD	HL,(K-CUR)	Fetch K-CUR.
		RES	0,(MODE)	Signal 'K mode'.
		CALL	1655,MAKE-ROOM	Make two or three spaces.
		POP	BC	Restore the previous codes.
		INC	HL	Point to the first location.
		LD	(HL),B	Enter first code.
		INC	HL	Then enter the second code
		LD	(HL),C	which will be Overwritten if
				there are only two codes - i.e.
				with INK & PAPER.
		JR	0F8B,ADD-CH-1	Jump forward.

THE 'ADDCHAR' SUBROUTINE
This subroutine actually adds a code to the current EDIT or INPUT line.

0F81	ADD-CHAR	RES	0,(MODE)	Signal 'K mode'.
		LD	HL,(K-CUR)	Fetch the cursor position.
0F88	ADD-CH-1	CALL	1652,ONE-SPACE	Make a single space.
		LD	(DE),A	Enter the code into the space
		INC	DE	and signal that the cursor is to
		LD	(K-CUR),DE	occur at the location after. Then
		RET		return indirectly to ED-LOOP.

The editing keys are dealt with as follows:

0F92	ED-KEYS	LD	E,A	The code is transferred to
		LD	C,+00	the DE register pair.
		LD	HL,+0F99	The base address of the editing
				key table.
		ADD	HL,DE	The entry is addressed and
		LD	E,(HL)	then fetched into E.
		ADD	HL,DE	The address of the handling