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Man and His Van Directory - Computers
SUPERCONDUCTIVITY is usually turned on and off by cooling a material and then warming it up again. Now this switching has been done electronically, an achievement that could lead to far faster computer chips.
When certain metals are cooled to within a few degrees of absolute zero, quantum effects cause electrons to stop repelling each other and pair up. It is this pairing up that leads to superconductivity, the total absence of any electrical resistance.
Superconductors are an attractive future alternative to the microscopic semiconductor switches that are the ultimate building blocks of computer chips, as their lack of resistance means they can function much faster and do not generate any waste heat. They have not so far been widely used as a replacement for silicon because they are very difficult to fabricate and manipulate.
In a recent talk I gave for the North Orange County Computer Club, I outlined the history of the personal computer from the early models developed by Edmund Berkeley in the 1950s to today's mouse-controlled GUI machines. The wow factor for the personal computer has been on a roller coaster over the years, but we're now on a straightaway.
The first computers made for the public were little more than relay machines, or in the case of an early HP machine, analog computers. Whatever interest these devices held for the science-minded died around 1959 after users got tired of playing tic-tac-toe against them. Their big drawback (along with their feeble power) was that you had to use patch cords and toggle switches to program them. The Altair, launched in 1975, was toggle-oriented until Digital Research added an operating system, launching the new era of incredibly useful machines.
This was largely due to both the operating system and Don Lancaster's invention of the TV Typewriter -a system that pioneered the memory-mapped video that was a mainstay of early microcomputers. Rather than facing a stalled market, as in 1959, we ended up in a golden era of computer progress with the emergence of the GUI, which was pioneered by the Xerox Star, then popularized by the Macintosh and universalized by Microsoft.
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