Routines
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7D74: Keep this sentence's frame, so that the next line can answer a question about it
Used by the routines at ASK_WHICH, TARGET_TROUBLE and NO_INSTRUMENT.
It is copied up to COMMAND_FRAME, and QUESTION_WAITING says a question is waiting.
KEEP_QUESTION 7D74 LD (QUESTION_WAITING),A
7D77 PUSH IY
7D79 POP HL
7D7A LD DE,COMMAND_FRAME
7D7D LD BC,$0018
7D80 LDIR
7D82 RET
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