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⌂ ∞ Elite on the BBC Micro and NES

Start and end: ResetToStartScreen

[NES version, Bank 7]

       Name: ResetToStartScreen                                      [Show more]
       Type: Subroutine
   Category: Start and end
    Summary: Reset the stack and the game's variables and show the Start screen

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * DrawTitleScreen calls ResetToStartScreen




.ResetToStartScreen

 LDX #$FF               ; Set the stack pointer to $01FF, which is the standard
 TXS                    ; location for the 6502 stack, so this instruction
                        ; effectively resets the stack

 JSR ResetVariables     ; Reset all the RAM (in both the NES and cartridge), as
                        ; it is in an undefined state when the NES is switched
                        ; on, initialise all the game's variables, and switch to
                        ; ROM bank 0

 JMP ShowStartScreen    ; Jump to ShowStartScreen in bank 0 to show the start
                        ; screen and start the game