THE STATEMENT LOOP.
Each statement is considered in turn until the end of the line is reached.

1B28	STMT-LOOP	RST	0020,NEXT-CHAR	Advance CH-ADD along the line.
1B29	STMT-L-1	CALL	16BF,SET-WORK	The work space is cleared.
		INC	(SUBPPC)	Increase SUBPPC on each
				passage around the loop.
		JP	M,1C8A,REPORT-C	But only '127' statements are
				allowed in a single line.
		RST	0018,GET-CHAR	Fetch a character.
		LD	B,+00	Clear the register for later.
		CP	+0D	Is the character a 'carriage
		JR	Z,1BB3,LINE-END	return'; jump if it is.
		CP	+3A	Go around the loop again if
		JR	Z,1B28,STMT-LOOP	it is a ':'.

A statement has been identified so, first, its initial command is considered.

		LD	HL,+1 B76	Pre-load the machine stack
		PUSH	HL	with the return address
				- STMT-RET.
		LD	C,A	Save the command temporarily
		RST	0020,NEXT-CHAR	in the C register whilst
		LD	A,C	CH-ADD is advanced again.
		SUB	+CE	Reduce the command's code by
				+CE; giving the range +00 to
				+31 for the fifty commands.
		JP	C,18CA,REPORT-C	Give the appropriate error if
				not a command code.
		LD	C,A	Move the command code to the
				BC register pair (B holds +00).
		LD	HL,+1A48	The base address of the syntax
				offset table.
		ADD	HL,BC	The required offset is passed to
		LD	C,(HL)	the C register and used to
		ADD	HL,BC	compute the base address for
				the command's entries in the
				parameter table.
		JR	1B55,GET-PARAM	Jump forward into the scanning
				loop with this address.

Each of the command class routines applicable to the present command are executed in turn. Any required separators are also considered.

1B52	SCAN-LOOP	LD	HL,(T-ADDR)	The temporary pointer to the
				entries in the parameter table.
1B55	GET-PARAM	LD	A,(HL)	Fetch each entry in turn.
		INC	HL	Update the pointer to the
		LD	(T-ADDR),HL	entries for the next pass.
		LD	BC,+1B52	Pre-load the machine stack
		PUSH	BC	with the return address -
				SCAN-LOOP.
		LD	C,A	Copy the entry to the C register
				for later.
		CP	+20	Jump forward if the entry is
		JR	NC,1B6F,SEPARATOR	a 'separator'.
		LD	HL,+1C01	The base address of the
				'command class' table.
		LD	B,+00	Clear the B register and
		ADD	HL,BC	index into the table.
		LD	C,(HL)	Fetch the offset and compute
		ADD	HL,BC	the starting address of the
				required command class routine
		PUSH	HL	Push the address on to the
				machine stack.