Ian Logan

Launched in 1981, Sir Clive Sinclair's ZX81 - successor to his ZX80 released the year before - was designed to be a low-cost introduction to home computing for the general public. It was a hugely successful machine, with over one and a half million 'official' units being sold; many more unauthorised 'clones' were also produced, particularly in Russia and other Eastern Bloc countries of the era. One could either purchase the machine pre-built, or - as a significant number of consumers did - buy it in kit form for assembly at home at a slightly cheaper price. This 'DIY' approach, encouraged by Sinclair Research, became a core element of the computer's genetic make-up. Those who were comfortable putting together the four silicon chips and other such components were just as keen to poke around the machine's memory, learning as much as they could about its capability; the programs they would write could easily be shared once saved onto a standard audio cassette. This book helps the reader truly understand how the ZX81 works, with sections covering everything from the structure of the Z80 microprocessor used in the machine to the computer's registers, ALU and more. With an introduction to both binary and hex, Understanding Your ZX81 ROM helped many people get the most out of their machine in the very earliest days of home computing.

In Logomotive Ian Logan's photographs are assembled into chapters and picture essays recalling the great days of lines such as the Santa Fe, the Union Pacific, and the Kansas City Southern. Some of his journeys are presented as travelogues in which he meets the Fat Controller, gets to sound the horn, and wanders into freight yards to see the last generation of streamline locomotives rusting amid the weeds. Animal motifs, Native American allusions, advertising slogans, names of famous trains such as the Super Chief and the Wabash Cannonball provide the subject matter for other picture features.

Anselm’s Proslogion has sparked controversy from the time it was written (c.1077) to the present day. Attempts to provide definitive accounts of its argument have led to a wide and contradictory variety of interpretations. In this book, Ian Logan goes back to basics, to the Latin text of the Proslogion with an original parallel English translation, before tracing the twists and turns of this controversy. Helping us to understand how the same argument came to be regarded as based on reason alone by some and on faith alone by others, as a logically sound demonstration by its supporters and as fatally flawed by its opponents, Logan considers what Anselm is setting out to do in the Proslogion, how his argument works, and whether it is successful.

Anselm’s Proslogion has sparked controversy from the time it was written (c.1077) to the present day. Attempts to provide definitive accounts of its argument have led to a wide and contradictory variety of interpretations. In this book, Ian Logan goes back to basics, to the Latin text of the Proslogion with an original parallel English translation, before tracing the twists and turns of this controversy. Helping us to understand how the same argument came to be regarded as based on reason alone by some and on faith alone by others, as a logically sound demonstration by its supporters and as fatally flawed by its opponents, Logan considers what Anselm is setting out to do in the Proslogion, how his argument works, and whether it is successful.