20 Goto 10

Whether you're interested in machines from the mainstream such as Sinclair, Acorn, Atari, Famicom, Sega, Nintendo, Sony, and Commodore, or the lesser known cabal of Dragon, Tandy, Oric, Amstrad, DEC, Jupiter, Vectrex, TI, and NewBrain (or even the virtually unheard of COSMAC Elf)
20 GOTO 10 is a book of numbers that describes the many facets of computing history, focusing on the golden age of old computers and retro games and consoles of the 1980s and 90s.

It covers the hardware, software, and social history of the era showing how they're linked through numbers, such as 48K, C90, and 35899.
Each entry starts with a number, and by choosing a related number you'll create a unique adventure through the book and into a web of forgotten geek lore and incredible facts. With luck, you'll find a way to arrive at the number used to grant infinite lives in Jet Set Willy!