Dashboard: SCAN_b1

       Name: SCAN_b1                                                 [Show more]
       Type: Subroutine
   Category: Dashboard
    Summary: Call the SCAN routine in ROM bank 1
  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:
             * MVEIT (Part 9 of 9) calls SCAN_b1


.SCAN_b1

 LDA currentBank        ; If ROM bank 1 is already paged into memory, jump to
 CMP #1                 ; bank28
 BEQ bank28

 PHA                    ; Otherwise store the current bank number on the stack

 LDA #1                 ; Page ROM bank 1 into memory at $8000
 JSR SetBank

 JSR SCAN               ; Call SCAN, now that it is paged into memory

 JMP ResetBank          ; Fetch the previous ROM bank number from the stack and
                        ; page that bank back into memory at $8000, returning
                        ; from the subroutine using a tail call

.bank28

 JMP SCAN               ; Call SCAN, which is already paged into memory, and
                        ; return from the subroutine using a tail call