EX	DE,HL	'Start' of new string to HL.
				'Pointer' to new arear to DE.
		LD	A,B	Jump forward if the
		OR	C	'new' string is a 'null'
		JR	Z,2BA3,L-IN-W/S	string.
		LDIR		Otherwise move the 'new'
				string to the work space.

The values that have been saved on the machine stack are restored.

2BA3	L-IN-W/S	POP	BC	'Length' of new area.
		POP	DE	'Pointer' to new area.
		POP	HL	The start - the pointer
				to the 'variable in assignment'
				which was originally in DEST.
				L-ENTER is now used to pass
				the 'new' string to the variables
				area.


THE 'L-ENTER' SUBROUTINE
This short subroutine is used to pass either a numeric value, from the calculator stack, or a string, from the work space, to its appropiate position in the variables area.
The subroutine is therefore used for all except 'newly declared' simple strings and 'complete & existing' simple strings.

2BA6	L-ENTER	EX	DE,HL	Change the pointers over.
		LD	A,B	Check once again that the
		OR	C	length is not zero.
		RET	Z
		PUSH	DE	Save the destination pointer.
		LDIR		Move the numeric value or the
				string
		POP	HL	Return with the HL register
		RET		pair pointing to the first byte
				of the numeric value or the
				string.


THE LET SUBROUTINE CONTINUES HERE
When handling a 'complete & existing' simple string the new string is entered as if it were a 'newly declared' simple string before the existing version is 'reclaimed'.

2BAF	L-ADD$	DEC	HL	Make HL point to the letter
		DEC	HL	of the variable's name.
		DEC	HL	i.e. DEST - 3.
		LD	A,(HL)	Pick up the letter.
		PUSH	HL	Save the pointer to the 'existing
				version'.
		PUSH	BC	Save the 'length' of the
				'existing string'.
		CALL	2BC6,L-STRING	Use L-STRING to add the new
				string to the variables area.
		POP	BC	Restore the 'length'.
		POP	HL	Restore the pointer.
		INC	BC	Allow one byte for the letter
		INC	BC	and two bytes for the length.
		INC	BC
		JP	19E8,RECLAIM-2	Exit by jumping to RECLAIM-2
				which will reclaim the whole
				of the existing version.

'Newly declared' simple strings are handled as follows:

2BC0	L-NEW$	LD	A,+DF	Prepare for the marking of
				the variable's letter.