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One common application in AF and RF alike is the need for a low pass filter. Motors and fluorescent lighting can result in a lot of audible noise in the power lines. There is a low cost way to eliminate the problem. The frequency of the filter is given by w=1/RC which is easier than …

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When a rock the size of mars hit the earth its clear it could alter the axis of rotation. This would explain the 23° 26′ 11.7′ tilt which is why the world has seasons. Other impacts have added more wobbles to the earth’s rotation. Over the course of 25,772 years the entire zodiac cycles though …

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The Altair 8800 computer system is based on the Intel 8080 CPU. The basic machine in kit form is $439. Intel 8080 1K or 4K boards available Serial board available The Altair 8800 was tricky to use with dynamic memory. Third party static memory runs far better. Altair BASIC was the first machine to license …

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In 1974, Dr. Gary A. Kildall, while working for Intel, created CP/M as the first operating system for the new microprocessor. CP/M based machines helped propel personal computers in the 1970s. Machines were much less expensive than mainframe based solutions. Intel 8080 Intel 8085 Zilog Z80 The early 8-bit processors topped out at 64KB of memory. …

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I started working with electrolysis in grade 10 chemistry. The work was far more sophisticated than I originally expected but I am well skilled in inorganic chemistry. I originally used a beaker with 2 nails for both the anode and cathode. The gas released seemed to be complicated too suggesting chlorine was being released in …

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The laws of physics are constant for any non accelerating observer. The speed of light is constant for all observers regardless of the motion of the light or the observer. Most are familiar with the doppler effect when a train horn passes by and the frequency changes as it passes. A similar effect is seen …

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ultra tank

Tank was released on November 4, 1974 by Kee Games. The game was developed by Kee Games. Tank is a two player battle game. This game is sometimes known as Ulta Tank but the game in 1974 was not very sophisticated. The monochrome CRT is able to show black and white players and the score …

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The Unix dd utility was delivered with version 5 which was seen at some universities who used the operating system. The dd tool was able to convert EBCDIC to ASCII or its inverse. This made it possible to use lower cost tty ASCII terminals which could be used as a front end to a machine. …

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The IBM System R is a new database built as a research project. System R introduced SQL which was the work of Chamberlain and Bryce. SQL offers two main advantages over older read–write APIs such as ISAM or VSAM. Firstly, it introduced the concept of accessing many records with one single command. Secondly, it eliminates …

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The Intel C8080A microprocessor was released circa April 1974. The CPU replaces the earlier Intel 8008 processor. Once CP/M was ready, the 8080 became a successful platform for business machines. As the 1970s unfolded large numbers of machines were designed and built. Several factors contributed to its popularity: its 40-pin package made it easier to …

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