Save and load: GetSaveAddresses

       Name: GetSaveAddresses                                        [Show more]
       Type: Subroutine
   Category: Save and load
    Summary: Fetch the addresses of the three saved parts for a specific save
             slot
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * CopyCommanderToBuf calls GetSaveAddresses
             * ResetSaveSlots calls GetSaveAddresses
             * SaveLoadCommander calls GetSaveAddresses


 Arguments:

   A                    The number of the save slot


.GetSaveAddresses

 ASL A                  ; Set X = A * 2
 TAX                    ;
                        ; So we can use X as an index into the saveSlotAddr
                        ; tables, which contain two-byte addresses

 LDA saveSlotAddr1,X    ; Set the following:
 STA SC                 ;
 LDA saveSlotAddr2,X    ;   SC(1 0) = X-th address from saveSlotAddr1, i.e. the
 STA Q                  ;             address of the first saved part for slot X
 LDA saveSlotAddr3,X    ;
 STA S                  ;   Q(1 0) = X-th address from saveSlotAddr2, i.e. the
 LDA saveSlotAddr1+1,X  ;            address of the second saved part for slot X
 STA SC+1               ;
 LDA saveSlotAddr2+1,X  ;   S(1 0) = X-th address from saveSlotAddr3, i.e. the
 STA Q+1                ;            address of the third saved part for slot X
 LDA saveSlotAddr3+1,X
 STA S+1

 RTS                    ; Return from the subroutine