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Moving: MVS5_b0

[NES version, Bank 7]

Name: MVS5_b0 [Show more] Type: Subroutine Category: Moving Summary: Call the MVS5 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: * HAS1 calls MVS5_b0
.MVS5_b0 STA storeA ; Store the value of A so we can retrieve it below LDA currentBank ; If ROM bank 0 is already paged into memory, jump to CMP #0 ; bank21 BEQ bank21 PHA ; Otherwise store the current bank number on the stack LDA #0 ; Page ROM bank 0 into memory at $8000 JSR SetBank LDA storeA ; Restore the value of A that we stored above JSR MVS5 ; Call MVS5, 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 .bank21 LDA storeA ; Restore the value of A that we stored above JMP MVS5 ; Call MVS5, which is already paged into memory, and ; return from the subroutine using a tail call