Routines
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99B4: Choose a behaviour at random
Picks a random entry (9BF4) from the character's reaction table (the address at offset 4 of its table entry) and makes it the character's current behaviour program. The range is the smaller of byte 1 of the instruction and byte 1 of the character's table entry. The entry at 99C3 selects entry E instead.
99B4 LD A,(IX+$01) A = the range given in the instruction...
99B7 CP (IY+$01) ...but no more than the character's own limit
99BA JR C,$99BF
99BC LD A,(IY+$01)
99BF CALL $9BF4 Pick a random entry number
99C2 LD E,A
This entry point is used by the routine at 976C.
99C3 LD A,(IY+$01) (Entry point with E already set) Make sure it is within the limit
99C6 CP E
99C7 JR NC,$99CA
99C9 LD E,A
99CA LD L,(IY+$04) HL = the reaction table
99CD LD H,(IY+$05)
99D0 LD D,$00
99D2 ADD HL,DE Three bytes per entry
99D3 ADD HL,DE
99D4 ADD HL,DE
99D5 INC HL Skip the action byte
99D6 LD E,(HL) DE = the program address
99D7 INC HL
99D8 LD D,(HL)
99D9 LD (IY+$02),E Make it the character's program
99DC LD (IY+$03),D
99DF RET
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