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⌂ ∞ ▽ Elite on the 6502

Utility routines: ResetBankA

[NES version, Bank 7]

       Name: ResetBankA                                              [Show more]
       Type: Subroutine
   Category: Utility routines
    Summary: Page a specified bank into memory at $8000 while preserving the
             value of A
  Deep dive: Splitting NES Elite across multiple ROM banks

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




 Arguments:

   Stack                The number of the bank to page into memory at $8000



.ResetBankA

 STA storeA             ; Store the value of A so we can retrieve it below

 PLA                    ; Fetch the ROM bank number from the stack

 JSR SetBank            ; Page bank A into memory at $8000

 LDA storeA             ; Restore the value of A that we stored above

 RTS                    ; Return from the subroutine