Nvidia ATA bus. Vypada to na obecny problem s napajenim. Jelikoz PS/2 porty obsluhuje I/O controller, coz je samostatny svab a ATA rozhrani je zase v chipsetu, coz je uplne jiny svab. Zdroj, MB:
http://en.community.dell.com/cfs-file.ashx/__key/communityserver-discussions-components-files/3514/4237.bad_2D00_caps_2D00_3.jpg