Testing new U401/U421 function – Part 1

October 30, 2009

New capabilities are being added to the U401/U421 firmware. The first new function that I am testing here is a “Quiz Show” function. Also called “Fastest Finger First”, as it shows which line, of all sixteen of the lines on the device, has been pressed first. This capability is used in game/quiz shows and contests. [...]

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Counting to 2F

October 4, 2009

I keep a lot of old things that I’ve made. Perhaps too many. In cleaning out boxes of old circuit boards – full designs, partial designs, experiments – I found a board that I had put to a lot of good use. Many times I’ll have a latched 8-bit port on a microcontroller that I [...]

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