Category: news

THE C PROGRAMMING LANGUAGE

The C Progtamming Language is a new idea for development. Brian Kernighan and Dennis Ritchie are the authors. C was created by Dennis Ritchie at Bell Labs in the early 1970s as an augmented version of Ken Thompson’s B. Another Bell Labs employee, Brian Kernighan, had written the first C tutorial, and he persuaded Ritchie …

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CORRECT ÆNGLISH SPELLING AND WRITING

Movable type printing sloƿly changed the ƿriting making the more standardized. Þe typeƿriters did not have several letters in ænglish. Immediately some may notice þe diphþong in the name which is the correct spelling. Her Majesty Queen Elizabeth would completely agree that the modern language is a mess. Writing is becoming less phonetic. Small wonder …

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DEC VT52

DEC VT52

The DEC VT52 is a new full featured serial terminal. The terminal is designed to work with the VAX and PDP computer systems. The VT52 works fine with the Altair 8800 machines as well. Construction: Single unit Display: 24×80 character cells Character matrix: 7×7 Screen size: 8.3″ x 4.1″ Character set: Complete US ASCII (128 …

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QUANTUM LINEAR ALGEBRA

For those with F- in linear algebra not to worry the math here is not require a Ph.D in Math. Much of the material is learn in freshman honors math. Some of the material does come from more advanced courses. Qubits are 0 or 1 and can jump back and forth or even be both …

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BASIC LOW PASS FILTER

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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ALTAIR 8800 COMPUTER SYSTEM

MITS_LOGO_1973

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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TANK

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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INDEXED SEQUENTIAL ACCESS METHOD

ibm-logo

Indexed Sequential Access Method (ISAM) was developed at a time when computer memory was a scarce resource. Accordingly IBM designed the system to use a minimum amount of memory.  The IBM System/360 had as little as 8KB of RAM while the top model had 64KB of RAM. The IBM System/370 is more powerful with additional memory. Tape …

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THE COMPLEXITY OF THEOREM PROVING PROCEDURES

chessboard

Steve Cook published The Complexity of Theorem Proving Procedures which definitely was eye opening. It is shown that any recognition problem solved by a polynomial time-bounded nondeterministic Turing machine can be reduced to the problem of determining whether a given propositional formula is a tautology. Here reduced means, roughly speaking, that the first problem can …

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VACUUM TUBE DEVICES

6922EH tube

Before the rise of TTL in the 1960s people used to use vacuum tube based radios and televisions. In high school there was a demonstration radio gear built into the study desks. Unfortunately several were damaged. I was able to repair them all and when the instructor saw the quality of workmanship he was amazed. …

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