Routines
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7C91: Copy a noun and its adjectives out of the command frame
Used by the routine at ASSIGN_PHRASES.
Six bytes from the frame offset in C -- 8 for the first noun phrase's noun, 18 for the second's -- into a slot, and sets bit 0 of the flag byte in HL if anything was there. The code before it chooses which phrase goes to TARGET_NAME and which to INSTRUMENT_NAME, by whether the second phrase's prepositions are the ones the command expects: ATTACK THE TROLL WITH THE SWORD makes the troll the target and the sword the instrument.
COPY_PHRASE 7C91 PUSH BC
7C92 LD C,A HL = the phrase in the frame, at offset A
7C93 LD B,$00
7C95 PUSH HL
7C96 PUSH IY
7C98 POP HL
7C99 ADD HL,BC
7C9A LD BC,$0006 Copy its noun and two adjectives to DE
7C9D LDIR
7C9F XOR A Walk back over the six bytes just copied: were any of them set?
7CA0 LD B,$06
COPY_PHRASE_0 7CA2 DEC HL
7CA3 OR (HL)
7CA4 DJNZ COPY_PHRASE_0
7CA6 POP HL
7CA7 POP BC
7CA8 RET Z No: nothing was named here
7CA9 SET 0,(HL) Yes: set bit 0 of the flag byte
7CAB RET
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