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In 1978, a Harvard Business School student named Dan Bricklin was sitting in a classroom, watching his accounting lecturer filling in rows and columns on the blackboard. Every time the lecturer changed a figure, he had to work down and across the grid on the board, erasing and rewriting other numbers to make everything add up, just as accounting clerks all over the world did every day in the pages of their ledgers. It's boring and repetitive work. A two-page spread across the open fold of the ledger is called a "spreadsheet". --- It's a cliche that the robots are...

The 6502 CPU is a fondly-remembered CPU* for good reason: along with chips from Motorola, Intel and Zilog, it helped create the personal computer business in the 1980s. However, this project is affection on a grand scale: some US enthusiasts are creating a transistor-for-transistor replica of the chip's design using discrete components. It's a good thing we're in the era of surface mount components, because even with small components the 3,218 transistors, 1,019 resistors and various other bits of the MOnSter 6502 need a four-layer PCB measuring 12” x 15” with components mounted on both sides. Because a big, slow,...