Robert Bruce Thompson is a coauthor of O'Reilly's Building the Perfect PC and PC Hardware in a Nutshell. A born geek, he built his first computer in 1976 with 256 bytes of memory, toggle switches, and no operating system. Since then, he has bought, built, upgraded, and repaired hundreds of PCs for himself, employers, customers, friends, and clients. Robert spends most clear, moonless nights outdoors with his 10-inch Dobsonian reflector telescope, hunting down faint fuzzies, and is currently designing a larger truss-tube Dobsonian (computerized, of course) that he plans to build.