The TT170 subroutine - Elite on the BBC Micro

       Name: TT170                                                   [Show more]
       Type: Subroutine
   Category: Start and end
    Summary: Main entry point for the Elite game code
  Deep dive: Program flow of the main game loop
    Context: See this subroutine in context in the source code
 Variations: See code variations for this subroutine in the different versions
 References: This subroutine is called as follows:
             * S% calls TT170


 This is the main entry point for the main game code.


.TT170

 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. We need to do this
                        \ because the loader code in elite-loader.asm pushes
                        \ code onto the stack, and this effectively removes that
                        \ code so we start afresh

                        \ Fall through into BR1 to start the game
Start and end: TT170

[BBC Micro cassette version]
