gcl0x

{
  Loading Tic-Tac-Toe as a BASIC program requires loading Tiny BASIC first,
  and after that the GTB lines as GT1 segments. The GTB includer has converted
  every basic line to a segment in memory. It also adds a segment that
  overwrites BASIC's initial end-of-program pointer, hence this load order.
  Keep knowledge of this two-stage process out of MainMenu.
}

  \SYS_Exec_88 _sysFn=          {Make no assumption on what's in sysFn}
  \returnHere _vLR=             {Return to this location after SYS}
  \TinyBASIC _sysArgs0= 88!!    {Load TinyBASIC image but don't execute yet}

*=$ffa0                         {Unclobberd location: Tiny BASIC's SAVE buffer}
_returnHere=*
  \userCode _vLR=               {TinyBASIC uses the standard start address}
  \TicTacGtb _sysArgs0= 88!!    {Load Tic-Tac-Toe and start BASIC when done}