THE 'MERGE' CONTROL ROUTINE
There are three main parts to this routine.

i. LOAD the data block into the work space.
ii. MERGE the lines of the new program into the old program.
iii. MERGE the new variables into the old variables.

Start therefore with the LOADing of the data block.

08B6	ME-CONTRL	LD	C,(IX+0B)	Fetch the 'length' of the
		LD	B,(IX+0C)	data block.
		PUSH	BC	Save a copy of the 'length'.
		INC	BC	Now made 'length+1' locations
		RST	0030,BC-SPACES	available in the work space.
		LD	(HL),+80	Place an end-marker in the
				extra location.
		EX	DE,HL	Move the 'start' pointer to the
				HL register pair.
		POP	DE	Fetch the original 'length'.
		PUSH	HL	Save a copy of the 'start'.
		PUSH	HL	Now set the IX register pair
		POP	IX	for the actual LOAD.
		SCF		Signal 'LOAD'.
		LD	A,+FF	Signal 'data block only'.
		CALL	0802,LD-BLOCK	LOAD the data block.

The lines of the new program are MERGEd with the lines of the old program.

		POP	HL	Fetch the 'start' of the new
				program.
		LD	DE,(PROG)	Initialise DE to the 'start' of
				the old program.

Enter a loop to deal with the lines of the new program.

08D2	ME-NEW-LP	LD	A,(HL)	Fetch a line number and test
		AND	+C0	it.
		JR	NZ,08F0,ME-VAR-LP	Jump when finished with all
				the lines.

Now enter an inner loop to deal with the lines of the old program.

08D7	ME-OLD-LP	LD	A,(DE)	Fetch the high line number
		INC	DE	byte and compare it.
		CP	(HL)	Jump forward if it does not
		INC	HL	match but in any case advance
		JR	NZ,08DF,ME-OLD-L1	both pointers.
		LD	A,(DE)	Repeat the comparison for the
		CP	(HL)	low line number bytes.
08DF	ME-OLD-L1	DEC	DE	Now retreat the pointers.
		DEC	HL
		JR	NC,08EB,ME-NEW-L2	Jump forward if the correct
				place has been found for a line
				of the new program.
		PUSH	HL	Otherwise find the address of
		EX	DE,HL	the start of the next old line.
		CALL	19B8,NEXT-ONE
		POP	HL
		JR	08D7,ME-OLD-LP	Go round the loop for each of
				the 'old lines'.
08EB	ME-NEW-L2	CALL	092C,ME-ENTER	Enter the 'new line' and go
		JR	08D2,ME-NEW-LP	round the outer loop again.

In a similar manner the variables of the new program are MERGEd with the variables of the old program.
	A loop is entered to deal with each of the new variables in turn.

08F0	ME-VAR-LP	LD	A,(HL)	Fetch each variable name in