As discussed last year in a Facebook group, this year’s holiday project is a ” Elektor Junior Computer” revival project. This means I will redesign. The Elektor Junior Computer was a simple based Microprocessor development board published in the s in the Dutch, German and later French and. Along the lines of the MOS Tech KIM, the Synertek SYM and Rockwell AIM, Elektor Electronics also published their SBC – The Junior.

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PDF file of the juniod two dutch articles and with the complete hardware design. A programmable timer can also be seen in the PIA block in figure 2. The remaining keys are assigned various control functions. PCB copper electroplating line in the process of pattern plating copper.

Floppy-disk controller — A floppy-disk controller is a special-purpose chip and associated disk controller circuitry that directs and controls reading from and writing to a computers floppy disk drive.

Elektor Junior-Computer Buch 1 (German)

This feature can be useful when the computer is used with a relatively slow device a human for instance. The headline performance of the connectors is a 2 amp per pin copmuter carrying capacity, both these figures may need to be de-rated according to safety requirements or environmental conditions. The various bytes have to be available on request, thus there are ten address lines connected to it giving 2 10 or different combinations.

Not quite so important but very very useful is the fact that IC sockets also have pin 1 marked in some way or other — the socket can be the wrong way round as long as the IC inserted into it is the correct way round. The overall speed of elektorr system is dependent on the speed of the switches, tube computers like EDVAC tended to average eight hours between failures, whereas relay computers like the Harvard Mark I failed very rarely.

This is not the case with electrolytics. Member feedback about Elektor Junior Computer: Each individual line can operate independently of the other 15 at any given moment, as an input or as an output.

See here the description and circuit design.

Once the boards are complete and correctly interconnected, it is time to test them. This is a flat commputer of conductors which are colour-coded for easy connection.


As a second possibility, Dp1 and Dp2 can show the hexadecimal code of an instruction op-code while the remainder show the address of the data corresponding to this instruction. Switch S24 has been mentioned before with relation to the NMH signal.

From Wikipedia, the free encyclopedia. Care must be taken to connect the diode the right way round. Either one end has an indented ring or the positive lead has a red mark. Many articles in the Elektuur magazine and booksa book in the same series, in Dutch, English, French and German elsktor been published. YouTube Videos [show more]. Both types of devices have a Chip Select! Looking at it realistically, the hexadecimal keyboard co,puter the standard input source, and the hexadecimal display as the output indication, are the simplest and least expensive methods of interacting with the computer.

The keyboard and display complete the package.

Elektor Junior Computer – WikiVisually

Downloadable documents are dutch versions only! To lower the price, the IC chip size would have to shrink so that more chips could be produced on each silicon wafer and this could be done by removing inessential features in the and using a newer fabrication technology, depletion-mode MOS transistors 3.

This was one of the things that was fixed soon after with the redesign to a commercial product. On to the memory.

Some amount is also embedded in all modern appliances, toys. Dp4 will indicate an address and the other two Dp5 and Dp6 will show the data in the address location concerned. Several techniques have been proposed to power consumption of SRAM-based memory structures.

Using two pieces of wire, one on the top side of the hole and the other on the opposite side, if the bell sounds the plating is good. A personal computer can run terminal emulator software that replicates the function of a terminal, sometimes allowing concurrent use of local programs and access to a distant terminal host system. His first assignment was helping define the peripheral ICs for the family, Motorolas engineers could run analog and digital simulations on an IBM mainframe computer.

Integrated displays also exist, with single or multiple digits, some of these integrated displays incorporate their own internal decoder, though most do not, each individual LED is brought out to a connecting pin as described. The latter mode makes program entry much simpler.


To make assembly as simple and as trouble-free as possible, this section should be read with extra care and attention. Twenty-two segment displays capable of displaying the full ASCII character set were available in the early s. It took Elektuur some time and the potential user a lot of money to add a cassette interface tot the Junior design, Many users therefore bought the scalled musicprint cassette interface.


W signal of the microprocessor. Later printing terminals such as the DECwriter Computre were developed, however printing terminals were limited by the speed at which paper could be printed, and for interactive use the paper record was unnecessary. Presence of a voltage on this gate creates a channel in the transistor. During this time it made economic sense for manufacturers to make microcomputers aimed at the home user. The programming process is not electrically reversible, to erase the data stored in the array of transistors, ultraviolet light is directed onto the die.

Early CPUs were custom designs used as part of a larger, however, this method computter designing custom CPUs for a particular application has largely given way to the development of multi-purpose processors produced in large quantities.

For the time being you only elekotr to compare the readouts with figure The fourth ring indicates the tolerance how much above or below the actual value it may be of the resistor.

Bottom side of an Intel DX2showing its pins. Computer terminal — A computer terminal is an electronic or electromechanical hardware device that is used for entering data into, and displaying data from, a computer or a computing system.

Source and drain contacts are made to regions at the end of the channel, an insulating layer of oxide is grown over the channel, then a conductive gate electrode is deposited, and a further thick layer of oxide is deposited computet the gate electrode.

Many hobbyist have built one.