This book discusses some of the computers I had direct hands-on experience with. It covers both hardware and software.

The author's first computer experience was on a Bendix G-20 mainframe, a 32-bit machine, using the Algol language. His first assembly language was on an IBM S/360 mainframe, specifically the Model 67 variant, with virtual memory. He went on to program the Univac 1108 series mainframe (a 1's complement machine), the DEC PDP-8, 9, 10, and 11, the Bendix G-15, the Athena Missile Guidance Computer by Sperry Rand and many more. The concept of a personal computer was, at the time, ludicrous.

I have touched, used, and occasionally broken every computer in this book. A wider range of computers is discussed in my book, Mainframes, Computing on Big Iron.