Skip to navigation

⌂ ∞ Elite on the BBC Micro and NES

Utility routines: SetNonZeroBank

[NES version, Bank 7]

       Name: SetNonZeroBank                                          [Show more]
       Type: Subroutine
   Category: Utility routines
    Summary: An unused routine that pages a specified ROM bank into memory at
             $8000, but only if it is non-zero
  Deep dive: Splitting NES Elite across multiple ROM banks

    Context: See this subroutine in context in the source code
 References: No direct references to this subroutine in this source file




 Arguments:

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



.SetNonZeroBank

 CMP currentBank        ; If the ROM bank number in A is non-zero, jump to
 BNE SetBank            ; SetBank to page bank A into memory, returning from the
                        ; subroutine using a tail call

 RTS                    ; Otherwise return from the subroutine