Routines
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AE30: Get a flag to specify if a room can only be reached via the "in" key
Used by the routine at ADBA.
Input
A Holds the room number, returns with the appropriate flag
AE30 EXX Swap general registers.
AE31 LD HL,$AE3C Point HL at the start of the flags. (AE3C)
AE34 ADD A,L Add the room number.
AE35 JR NC,$AE38 Move forward if there is no overflow (shouldn't be).
AE37 INC H Otherwise increment H to allow for carry.
AE38 LD L,A Set the low byte to give the correct address.
AE39 LD A,(HL) Put the flag for this room in A.
AE3A EXX Swap back general registers and return.
AE3B RET
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