Routines
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44857: Check Room Objects
Used by the routine at Handler_RoomExits.
Input
A Room number
Output
A 0 when a visible object is here; otherwise non-zero (1, or the room number when nothing is in the room)
F Z is set when a visible object was found
CheckRoomObjects 44857 LD HL,42604 HL=Table_ItemEventLocations.
44860 LD BC,(42982) BC=*Count_Objects.
CheckRoomObjects_Loop 44864 CPIR Search for the room number in the table.
44866 RET NZ Return if the room number is not in the table.
44867 PUSH HL Stash the object location table pointer on the stack.
44868 CALL ValidateObject Call ValidateObject.
44871 POP HL Restore the object location table pointer from the stack.
44872 JR NZ,CheckRoomObjects_Found Jump to CheckRoomObjects_Found if a visible object is here.
44874 LD E,A Temporarily store A in E.
44875 LD A,B Are there more objects to check?
44876 OR C
44877 LD A,E Restore the A register.
44878 JR NZ,CheckRoomObjects_Loop Jump to CheckRoomObjects_Loop if there are more objects to check.
No visible object was found.
44880 LD A,1 Set A to 1 (NZ): no visible objects.
44882 AND A Set the flags from A.
44883 RET Return.
A visible object was found.
CheckRoomObjects_Found 44884 XOR A Set A to 0 (Z): a visible object was found.
44885 RET Return.
View the equivalent code in The Jewels Of Babylon.
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