LD	A,H	Jump forward and hence round
		AND	+07	the loop again directly for the
		JR	NZ,0EC9,COPY-2	eight pixel lines of a character
				line.

For each new line of characters the base address has to be updated.

		LD	A,L	Fetch the low byte.
		ADD	A,+20	Update it by +20 bytes.
		LD	L,A	The carry flag will be reset when
				'within thirds' of the display.
		CCF		Change the carry flag.
		SBC	A,A	The A register will hold +F8
		AND	+F8	when within a 'third' but +00
				when a new third' is reached.
		ADD	A,H	The high byte of the
		LD	H,A	address is now updated.
0E09	COPY-2	DJNZ	0EB2,COPY-1	Jump back until '176' lines have
				been printed.
		JR	0EDA,COPY-END	Jump forward to the end
				routine.

THE 'COPY-BUFF' SUBROUTINE
This subroutine is called whenever the printer buffer is to have its contents passed to the printer.

0ECD	COPY-BUFF	DI		Disable the maskable interrupt.
		LD	HL,+5800	The base address of the printer
				buffer.
		LD	B,+08	There are eight pixel lines.
0ED3	COPY-3	PUSH	BC	Save the line number.
		CALL	0EF4,COPY-LINE	It is called '8' times.
		POP	BC	Fetch the line number.
		DJNZ	0ED3,COPY-3	Jump back until '8' lines
				have been printed.

Continue into the COPY-END routine.

0EDA	COPY-END	LD	A,+04	Stop the printer motor.
		OUT	(+FB),A
		EI		Enable the maskable interrupt
				and continue into CLEAR-PRB.

THE 'CLEAR PRINTER BUFFER' SUBROUTINE
The printer buffer is cleared by calling this subroutine.

0EDF	CLEAR-PRB	LD	HL,+5B00	The base address of the printer
				buffer.
		LD	(PR-CC_lo),L	Reset the printer 'column'.
		XOR	A	Clear the A register.
		LD	B,A	Also clear the B register in
				effect B holds dec.256).
0EE7	PRB-BYTES	LD	(HL),A	The '256' bytes of the
		INC	HL	printer buffer are all
		DJNZ	0EE7,PRB-BYTES	cleared in turn.
		RES	1,(FLAGS2)	Signal 'the buffer is empty'.
		LD	C,+21	Set the printer position and
		JP	0DD9,CL-SET	return via CL-SET & P0-STORE.

THE 'COPY-LINE' SUBROUTINE
The subroutine is entered with the HL register pair holding the base address of the thirty two bytes that form the pixel-line and the B register holding the pixel-line number.

0EF4	COPY-LINE	LD	A,B	Copy the pixel-line number.
		CP	+03	The A register will hold
		SBC	A,A	+00 until the last two lines
		AND	+02	are being handled.