THE 'EXPECT NUMERIC/STRING EXPRESSIONS' SUBROUTINE
There is a series of short subroutines that are used to fetch the result of evaluating the next expression. The result from a single expression is returned as a 'last value' on the calculator stack.
	The entry point NEXT-2NUM is used when CH-ADD needs updating to point to the start of the first expression.

1C79	NEXT-2NUM	RST	0020,NEXT-CHAR	Advance CH-ADD.

The entry point EXPT-2NUM (EQU. CLASS-08) allows for two numeric expressions, separated by a comma, to be evaluated.

1C7A	EXPT-2NUM	CALL	1C82,EXPT-1NUM	Evaluate each expression in
	(CLASS-08)			turn - so evaluate the first.
		CP	+2C	Give an error report if the
		JR	NZ,1C8A	separator is not a comma.
		RST	0020,NEXT-CHAR	Advance CH-ADD.

The entry point EXPT-1NUM (EQU. CLASS-06) allows for a single numeric expression to be evaluated.

1C82	EXPT-1NUM	CALL	24FB,SCANNING	Evaluate the next expression.
	(CLASS-06)
		BIT	6,(FLAGS)	Return as long as the result was
		RET	NZ	numeric; otherwise it is an error.

Report C - Nonsense in BASIC

1C8A	REPORT-C	RST	0008,ERROR-1	Call the error handling
		DEFB	+0B	routine.

The entry point EXPT-EXP (EQU. CLASS-0A) allows for a single string expression to be evaluated.

1C8C	EXPT-EXP	CALL	24FB,SCANNING	Evaluate the next expression.
	(CLASS-0A)
		BIT	6,(FLAGS)	This time return if the result
		RET	Z	indicates a string; otherwise
		JR	1C8A,REPORT-C	give an error report.

THE 'SET PERMANENT COLOURS' SUBROUTINE (EQU. CLASS-07)
This subroutine allows for the current temporary colours to be made permanent. As command class 07 it is in effect the command routine for the six colour item commands.

1C96	PERMS	BIT	7,(FLAGS)	The syntax/run flag is read.
	(CLASS-07)
		RES	0,(TV-FLAG)	Signal 'main screen'.
		CALL	NZ,0D4D,TEMPS	Only during a 'run' call TEMPS
				to ensure the temporary colours
				are the main screen colours.
		POP	AF	Drop the return address -
				SCAN-LOOP.
		LD	A,(T-ADDR)	Fetch the low byte of T-ADDR
				and subtract +13 to give the
		SUB	+13	range +D9 to +DE which are the
				token codes for INK to OVER.
		CALL	21FC,CO-TEMP-4	Jump forward to change the
				temporary colours as directed
				by the BASIC statement.
		CALL	1BEE,CHECK-END	Move on to the next statement
				if checking syntax.
		LD	HL,(ATTR-T)	Now the temporary colour
		LD	(ATTR-P),HL	values are made permanent
				(both ATTR-P & MASK-P).
		LD	HL,+5C91	This is P-FLAG; and that too
		LD	A,(HL)	has to be considered.