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⌂ ∞ Elite on the BBC Micro and NES

Save and load: CheckSaveSlots

[NES version, Bank 6]

       Name: CheckSaveSlots                                          [Show more]
       Type: Subroutine
   Category: Save and load
    Summary: Load the commanders for all eight save slots, one after the other,
             to check their integrity and reset any that fail their checksums

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * CheckSaveSlots_b6 calls CheckSaveSlots




.CheckSaveSlots

 LDA #7                 ; There are eight save slots, so set a slot counter in
                        ; A to loop through them all

.sabf1

 PHA                    ; Wait until the next NMI interrupt has passed (i.e. the
 JSR WaitForNMI         ; next VBlank), preserving the value in A via the stack
 PLA

 JSR CopyCommanderToBuf ; Copy the commander file from save slot A into the
                        ; buffer at BUF, resetting the save slot if the file
                        ; fails its checksums

 SEC                    ; Decrement A to move on to the next save slot
 SBC #1

 BPL sabf1              ; Loop back until we have loaded all eight save slots

 RTS                    ; Return from the subroutine