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7FF9: Print "what?"
Prints 'what?' (the message at AC93) in the lower window, and returns with Z reset so that the command is abandoned.
7FF9 LD HL,$AC93 "what?"
7FFC LD A,$01 Send it to the lower (input) window...
7FFE LD ($B5F2),A
8001 CALL $72D4 ...and print it
8004 OR $01 Make A non-zero...
8006 RET ...so the main loop knows this command has failed
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