GameBoy\Cbopcode::cbopcode31 PHP Method

    private static function cbopcode31(Core $core)
    {
        $newFCarry = ($core->registerA & 0x1) == 0x1;
        $core->registerA = ($core->FCarry ? 0x80 : 0) + ($core->registerA >> 1);
        $core->FCarry = $newFCarry;
        $core->FHalfCarry = $core->FSubtract = false;
        $core->FZero = $core->registerA == 0x0;
    }