American Business Computer Catalog, 1981

So recent yet so old. TRS-80 Model 1 RAM (32K) expansion pack -- $359.95 -- "lowest price ever", etc.

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[2004 Jun 16] [/computers/history] [#]

http://dcoward.best.vwh.net/analog/

"An analog computer is a computing device that has two distinguishing characteristics: (1) Performs operations in a truly parallel manner. Meaning it can perform many calculations all at the same time. (2) And operates using continuous variables. Meaning it uses numbers that that change not in steps, but change in a smooth continuous manner. By constrast, a digital computer can only perform sequential (one at a time) operations, and operates on discrete (noncontinuous) numbers."

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[2004 Jan 26] [/computers/history] [#]

Rope and Pulley Computer

Made about 850CE, this computer uses ropes and pulleys to make the logic gates.

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[2004 Jan 26] [/computers/history] [#]