My dad had an Apple II in the late 1970s at home, which he hardwired to the heating system with sensors and used to control the temperature throughout his flt to keep his heating bills down, using software he wrote himself. From that he moved on to IBM PCs running DOS and OS/2 Warp.
My own first PC was one with a 386 processor running Windows for Workgroups 3.1 which I inherited from him in about 1991 or 92. I've had *counts on fingers* four since then. Plus an iBook.