Skip to navigation

⌂ ∞ Elite on the BBC Micro and NES

Start and end: SetupAfterLoad_b0

[NES version, Bank 7]

       Name: SetupAfterLoad_b0                                       [Show more]
       Type: Subroutine
   Category: Start and end
    Summary: Call the SetupAfterLoad routine in ROM bank 0
  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:
             * SaveLoadCommander calls SetupAfterLoad_b0




.SetupAfterLoad_b0

 LDA currentBank        ; If ROM bank 0 is already paged into memory, jump to
 CMP #0                 ; bank26
 BEQ bank26

 PHA                    ; Otherwise store the current bank number on the stack

 LDA #0                 ; Page ROM bank 0 into memory at $8000
 JSR SetBank

 JSR SetupAfterLoad     ; Call SetupAfterLoad, 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

.bank26

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