Routines
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AF56: Validate Object
Used by the routines at PrintObjects and CheckRoomObjects.
Input
BC Object counter
Output
F Z is unset if the object is valid, unset when invalid
ValidateObject AF56 PUSH AF Stash AF and BC on the stack.
AF57 PUSH BC
AF58 INC BC Adjust the object counter.
AF59 LD A,($A7E6) A=*Count_Objects.
AF5C SUB C Calculate the index and store the result in E.
AF5D LD E,A
AF5E LD IX,($A7CC) IX=*Pointer_ItemDescriptions.
AF62 CALL GetTableEntry Call GetTableEntry.
AF65 POP BC Restore the object counter from the stack.
AF66 LD A,H Jump to InvalidObject if the object is invalid.
AF67 OR L
AF68 JR Z,InvalidObject
AF6A POP AF Restore the object type from the stack.
AF6B AND A Clear the Z flag.
AF6C RET Return.
InvalidObject AF6D POP AF Restore AF from the stack.
AF6E CP A Set the Z flag.
AF6F RET Return.
View the equivalent code in The Jewels Of Babylon.
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