You do not have to have a dedicated computer. My computer runs Ham Radio Delux for rig control, and rotor control, a second winlink modem, DM-780 for Digital, UI-VIEW32 for APRS and the regular computer programs. If you still want to run a stand alone digipeater the Tiny Trac 4 is cheap and works well as a mobile or base digipeater.
73 de Lindy