Skip to navigation

⌂ ∞ ▽ Elite on the 6502

Text: PDESC_b2

[NES version, Bank 7]

       Name: PDESC_b2                                                [Show more]
       Type: Subroutine
   Category: Text
    Summary: Call the PDESC routine in ROM bank 2
  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:
             * TT25 calls PDESC_b2




.PDESC_b2

 LDA currentBank        ; Fetch the number of the ROM bank that is currently
 PHA                    ; paged into memory at $8000 and store it on the stack

 LDA #2                 ; Page ROM bank 2 into memory at $8000
 JSR SetBank

 JSR PDESC              ; Call PDESC, 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