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In the early 70th, Dr. Keith Taft began developing the first computer hidden blackjack and 1972 Keith had started using a computer in Nevada casinos to play "perfect" blackjack. Nevada had no laws at that time prohibiting the use of devices at their tables. Keith's first computer weighed seven kilos. Then develop dozens of concealable computers and other electronic devices over the next two decades, increasingly smaller and more powerful. In half of the '70s, Keith and his son, Marty, had met Al Francesco, and they would meet the teams of players using computers to beat the blackjack tables.
Here's how worked
At the end of each shoe there were two switches, or buttons and one above each big toe and a sub-for a total of four switches. Each switch sends a different code for the team, which is a small device embedded in epoxy, which is attached to the calf beneath the trousers. The computer it was the size of a pack of cigarettes, but thinner. Using a series of toe taps, like Morse code, the player can transmit all the equipment you need to know to make a decision in a game of blackjack: which cards have been dealt, what cards the player held, and the letter of the casino.
This computer communicated its decisions to the player with buzzes and taps the player's feet. It was not easy to use one of these devices. It essentially, learning "type" with your fingers. Even after had memorized the codes, enter via foot switches was a chore. It took weeks or even months of practice to reach the point where it could use the device at casino-dealing speed without foot cramps stopping you.

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Alex River
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from Blackjack encyclopedia

Article Source: ArticlesBase.com – Early Blackjack Counting Systems Development

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