fire:
   player = GetSourceRef();
   mode = GetSenderRef();

   // Check that the player is still alive.
   if(GetThingHealth(player) <= 0)
   {
      Return;
   }

   // Check Ammo - If we are out, autoselect best weapon.
   // It should always use two energy cells, but -- as in DF --
   // allow the last fire if there is only one left...
   if(GetInv(player, 11) < 1.0)
   {
      PlaySoundThing(outSound, player, 1.0, -1, -1, 0x80);
      if((GetAutoSwitch() & 1))
         SelectWeapon(player, AutoSelectWeapon(player, 1));
      Return;
   }

   powerBoost = GetInv(player, 63);
   if(mode == 1)  
   {
    // Fire2 - Fast Fire, Inaccurate.
    randVec = VectorSet((Rand()-0.5)*5, (Rand()-0.5)*5, 0.0);
    dummy = FireProjectile(player, projectile, fireSound, 8, '0.0168 0.1896 0.00', randVec, 1.0, 0x30, autoAimFOV, autoAimFOV*2);
    fireWait = 0.4;
    ChangeFireRate(player, fireWait/powerBoost);
   }
   else
   {
    // Fire1 - Slower Fire Rate, Accurate.
    randVec = VectorSet(0, 0, 0);
    dummy = FireProjectile(player, projectile, fireSound, 8, '0.0168 0.1896 0.00', randVec, 1.0, 0x30, autoAimFOV, autoAimFOV*2);
    fireWait = 0.8;
    ChangeFireRate(player, fireWait/powerBoost);
   }
   ChangeInv( player, 11, -2.0 );
   jkPlayPOVKey( player, povfireAnim, 1, 0x38 );
Return;