Stardust: STARS_b1

       Name: STARS_b1                                                [Show more]
       Type: Subroutine
   Category: Stardust
    Summary: Call the STARS 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:
             * Main flight loop (Part 16 of 16) calls STARS_b1
             * ShowScrollText calls STARS_b1


.STARS_b1

 LDA currentBank        ; If ROM bank 1 is already paged into memory, jump to
 CMP #1                 ; bank5
 BEQ bank5

 PHA                    ; Otherwise store the current bank number on the stack

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

 JSR STARS              ; Call STARS, 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

.bank5

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