private static function cbopcode17(Core $core)
{
$newFCarry = ($core->registerC & 0x80) == 0x80;
$core->registerC = ($core->registerC << 1 & 0xff) + ($core->FCarry ? 1 : 0);
$core->FCarry = $newFCarry;
$core->FHalfCarry = $core->FSubtract = false;
$core->FZero = $core->registerC == 0;
}