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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When it was introduced inthe was, by a considerable margin and it initially sold for less than one-sixth the cost of competing designs from larger companies, such as Motorola and Intel, and caused rapid decreases in pricing across the entire processor market.

All this means, effectively, that you cannot step through the monitor program held in IC2. The complete circuit diagram of the Junior Computer. It is simply a matter of putting little black boxes into the correct holes — anybody can do a jigsaw!

This is not the case with electrolytics. This allows DRAM to reach high densities. To make things clearer, the buses have been drawn as a single line. The memory also receives directions from the control bus, selection signals for instance. Elekror shows the Junior Computer is working properly. Static random-access memory — Static random-access memory is a type of semiconductor memory that uses bistable latching circuitry to store each bit. Computer terminal — A computer terminal is an electronic or electromechanical hardware device that is used for cmputer data into, and displaying data from, a computer or a computing system.

The data bus consists of eight conductors and is therefore capable of transferring eight bits of data at a time.

Elektor Junior Computer

The control bus regulates jjnior internal functions as well as telling the data bus which way to allow data to flow, whether to transfer data into or away from the CPU. Programs In a package with Elektor hardware Octopus cards I recently bought, I found a little book and a floppy with Junior tape dumps. The remaining signal connected to the PIA is K6 from the address decoder. Data transfer is cojputer in 8-bit blocks, or one full byte at a time.



Retrieved from ” https: Junior computer 3 Elektuur Junior boek 3 NL. The switches are connected to the main board by six short flexible insulated wire links. For example, all the anodes of the A segments of each digit position would be connected together and to a driver circuit pin, while the cathodes of all segments for each digit would be connected.

Not only hobbyists but also professionals. It also served users of the microprocessor as a method to prototype applications in products. Member feedback about College of Engineering Karunagappally: YouTube Videos [show more].

The other keys shown in figure 4 S3 … S23 are arranged in a matrix of three rows and seven columns. The track pattern of the lower side of the main board.

As can be seen, the limit for 4 lines of binary data is reached with only sixteen combinations, whereas with a normal base ten count ten thousand combinations are possible 0. Remember, even though it is an LED, it is still a diode, and its polarity will have to be determined.

The control bus does this via bidirectional data bus buffers which, according to control bus signals, jujior data to pass in the proper direction only.

Many books were available demonstrating small assembly language programs for the KIM, one demo program converted the KIM into a music box by toggling a software-controllable output bit connected to a small loudspeaker. Home computers Revolvy Brain revolvybrain. We, however, have a different opinion and set out to justify it by designing the Junior Computer. These should be mounted so that the switch housings are on the underside of the board.


Bad IC socket connection.

Elektor Junior-Computer Buch 1 (German) | Retro Commodore

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. Most of the disk controller functions are performed by the integrated circuit.

A control gate electrode is deposited and further oxide covers it, to retrieve data from the EPROM, the address represented by the values at the address pins of ujnior EPROM is decoded and used to connect one word of storage to the output buffer amplifiers.

All this may take a little time but it could save a lot of frustration later. The direction of data transfer is determined by the control bus.

For the time being you only have to compare the readouts with figure PDF file of issues to This epektor the list of dutch articles and books and paperware by Elektuur devoted to the CPU. Of course, data can only be transferred in one direction at a time.

Elektor Junior Computer – WikiVisually

If not, then the wire link is in the wrong place. A board designed in ; the sweeping curves in the traces are evidence of freehand design hunior adhesive tape.

There are of course two ways to mount an IC computre you guessed a right way and a wrong way you are not far out! More will be said about these when discussing operation.

Dynamic random-access memory — Dynamic random-access memory is a type of random-access memory that stores each bit of data in a separate capacitor within an integrated circuit. Member feedback about MOS Technology