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IBM 5100 COMPUTER

ibm-5100

The IBM 5100 computer is a new workstation that was developed at the IBM Palo Alto Scientific Center in 1973. $11000 for 16KB and $20000 for 64KB. IBM PALM CPU 16KB-64KB DC300 QIC tape drive serial port 5″ CRT display The IBM Los Gatos engineering prototype and a design model by IBM Industrial designer Tom …

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TIC TAC TOE

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Back in 1975 we developed a version of Tic Tac Toe that runs on the IBM System/360 or System/370 mainframe using a standard 3270 terminal. FORTRAN is standard for all mainframes from 1958 onwards. The code shown is standard FORTRAN IV which IBM developed and its largely compatible with more recent standards. FORTRAN arrays are …

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BARREL SHIFTER

74ls157

The Intel 8080 microprocessor is very powerful but it has limitations. The shift function on the acumulator has a binary equivalent of multiply by 2 or divide by 2. A barrel shifter is simply a multiplexer with however many bits need to be shited. The 74LS157 is a quad multiplexor in a 16-pin DIP. This …

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INSIDE THE POWER SUPPLY

TX850V2-cabble-assembly

The power supply has evolved over time however the basic technology has remained the same. Most of the changes over the years were driven by many different forces. BRIDGE RECTIFIER It takes 4 power diodes to covert the 115V AC to about 150V DC.  The reason the voltage is higher is that DC is based …

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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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MITHRAS

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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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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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CP/M GAMES

Intel_8085_arch

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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TIME & RELATIVITY

wall-clock

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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