GameBoy\Opcode::opcode15 PHP Method

    public static function opcode15(Core $core)
    {
        $core->FCarry = ($core->registerA & 1) == 1;
        $core->registerA = ($core->registerA >> 1) + (($core->registerA & 1) << 7);
        $core->FZero = $core->FSubtract = $core->FHalfCarry = false;
    }