Happy 30th Anniversary Portable Computing

It seems that as I was learning to crawl IBM were learning how to build a portable computer.
Geek.com provides us with a history lesson on portable computing
In 1973 IBM began working on a portable computing project called “Special Computer, APL Machine Portable” (SCAMP). The idea was to create an electronic digital computer that would be no larger than a typewriter and that could be used by an individual. Although the CPUs of these machines were slow, the users didn’t have to share CPU resources with others. The machine would have a built-in tape drive and a 5 inch CRT, and would be light enough so that a (strong) person could carry it. This machine would make extensive use of integrated circuits, and would be able to accommodate up to 64 KB of RAM. At the time, mini-mainframe computers contained 64 KB, so the machine could be considered a portable mini-mainframe. The machine was called the 5100, and the first prototypes were completed in early 1974. The 5100 became available for purchase in the fall of 1975, and was geared towards payroll and inventory tasks. The machine weighed up to 28 kilograms (60 pounds) in its heaviest configuration, and cost between US$10,000-20,000 (1975 dollars). The 5100 used a proprietary 1.9MHz CPU and contained a built-in basic interpreter. A carrying case and printer, as well as I/O adapters, were available extras. Primarily because of the high cost of the computer, the 5100 was not a succes

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