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BBC Micro Elite

Start and end: TT170 (6502SP version)

Name: TT170 [View in context] Type: Subroutine Category: Start and end Summary: Main entry point for the Elite game code Deep dive: Program flow of the main game loop
This is the main entry point for the main game code. It is called after the various setup, decryption and checksum routines in S%, G% and BEGIN have successfully completed. It is also called following death, and when the game is quit by pressing ESCAPE when paused.
.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 JSR RESET \ Call RESET to initialise most of the game variables \ Fall through into DEATH2 to start the game