83Plus:BCALLs:505C

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_RunCatalog1Hook EQU 505Ch  ;Undocumented 1.13

   ;Checks the byte @ the address @ catalog1HookPtr.
   ;If the byte is 83, it runs the hook. If the byte 
   ;is different, it resets the catalog1 hook flag.
   ;Inputs:     catalog1HookPtr      must be setup correctly
   ;Outputs:    HL          Int16   points to start of hook
   ;            F           Int8    F is 6A if not run

Michael Cimino