other pc compatibility solutions took a more native approach by running windows and ms-dos by using x86 expansion cards with an x86 chip on the card. apple offered some systems configured this way, marketed as "dos compatible"—a card with dedicated x86 cpu and ram was used, while the mac hard drive, sound subsystem, networking and input provided services to the pc. the pc could run simultaneously with the mac, and the user could switch between the two in a fashion similar to a kvm switch. the earliest of these systems were 680x0 based systems running system 7. system 7 provided the support for accessing the pc volume from the mac through its own pc exchange software, and actual control of the pc hardware was accomplished by way of control panels.