The Hobbit (v1.0): Routine at 7403

7403: Message code $10: "you are" or "thorin is"

Prints the actor's name (747F) and then returns ARE if the actor is Bilbo and IS otherwise, for the interpreter to print. Code $11 (741C) does the same for the target, and code $13 (7424) for an object pushed on the stack.
7403	LD A,($B5DB)	A = whose name to print - the actor here, or, via the entry points below, the target or a pushed object
7406	EX AF,AF'	Keep it safely out of the way while the name is printed
7407	XOR A	No article for a name
This entry point is used by the routine at 741C.
7408	LD ($B5F4),A	}
740B	EX AF,AF'	A = the object again
740C	PUSH AF	Save it once more
740D	CALL $747F	Print the name
7410	POP AF	A = the object once more
7411	AND A	Is it Bilbo (0)?
7412	LD DE,$039F	DE = ARE
7415	RET NZ	Not Bilbo: ARE is right, and Z is already reset, so it gets printed
7416	LD DE,$0065	Bilbo: DE = IS instead
7419	OR $01	Make A non-zero...
741B	RET	...so IS gets printed