|Other Retailer||Price Checked Time||Their Price in AUD||Our Price|
|Amazon UK||1 days ago||77.22||$42.65||You save $34.57|
|Amazon US||4 days ago||55.9||$42.65||You save $13.25|
|Book Depository US||2 days ago||46.99||$42.65||You save $4.34|
Robert Bruce Thompson is a coauthor of Building the Perfect PC, Astronomy Hacks, and the Illustrated Guide to Astronomical Wonders. Thompson built his first computer in 1976 from discrete chips. It had 256 bytes of memory, used toggle switches and LEDs for I/O, ran at less than 1MHz, and had 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, and is currently designing a larger, computerized, truss-tube Dobsonian that he plans to build. Barbara Fritchman Thompson is, with her husband Robert, the co-author of numerous books about computers, science, and technology. With her Masters in Library Science and twenty years' experience as a public librarian, Barbara is the research half of our writing team.