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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It will have some provision to accept and run a user-supplied program, such as downloading a program through a serial port to flash memory, or some form of programmable memory in a socket in earlier systems.


It goes without saying that extreme care must be taken to ensure that the leads are not mixed up. Both Intel and Motorola had initially announced a price for a single microprocessor. The first ring is the ring closest to one of the ends. The basic block diagram of a computer consists of three blocks and three buses.

From top to bottom: Where a system monitor program is used it is invariably stored in ROM. When one goes high, the other should go low and vice-versa. The four-digit date code indicates it was made in the 45th week of To make things clearer, the buses have been drawn as a single line. Displaying the information at video speeds was also a challenge and the control logic took up a rack worth of pre-integrated circuit electronics. Advanced PCBs may contain components embedded in the substrate, PCBs can be single sided, double sided or multi-layer.

This was one of the things that was fixed soon after with the redesign to a commercial product. A DIN connector on right side. 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.

The components should be mounted in the following order see figure 7 and the full parts list for the main board:.

Each storage location of an EPROM consists of a single field-effect transistor, each field-effect transistor consists of a channel in the semiconductor body of the device. Member feedback about Aster CT PDF file of the first two dutch articles and with the complete hardware design. This ring denotes the cathode the cathode is the thick line at one end of the triangle in the circuit diagram.


Although these have already been checked, there may be something on the main board which is causing problems. A minimal PCB with a component used for easier prototyping is called a breakout board.

A typical 7-segment LED display component, with decimal point. Looking at it realistically, the hexadecimal keyboard as 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 board are mounted on the top side of the board and all the rest of the components, excluding the power supply, are mounted on the bottom side.

Elektor is a monthly magazine about all aspects of electronics, first published as Elektuur in the Netherlands inand now published worldwide in many languages including English, German, Dutch, French, Greek, Spanish, Swedish, Portuguese European and Brazilian and Italian with distribution in over 50 countries. It was delivered as an electronic kitor could purchased as two printed circuit boards main board and Seven-segment display board only, for components to be installed. Data transfer is accomplished in 8-bit blocks, or one full byte at a time.

To determine the next successive address in a particular program, the program counter and the instructions already executed are analysed. Since the term CPU is generally defined as a device for software execution, the idea of a stored-program computer was already present in the design of J. The keyboard consists of 23 key-switches and 2 toggle switches. The elektir of a terminal is confined to display and input of data, a terminal that depends on the host computer for its processing power is called a dumb terminal or thin client.

Elektor Junior Computer

In the event that both of the interrupt functions are used at the same time, they are given a priority which is determined by the program. The track pattern of the lower side of the main board. Dp4 will indicate an address and the other two Dp5 and Dp6 will show the compute in the address location concerned. This is a logical safety measure, to prevent shorts between adjacent connections.


Elektor Junior-Computer Buch 1 (German)

Before starting the test procedure it is advisable to check all the components once again. We sincerely hope this section will not have to be read, but just in case something is wrong the most common faults and how to deal with them are listed below.

They were also used to show the dialed telephone number to operators during the transition from manual to automatic telephone dialing and they did not achieve widespread use until the advent of LEDs in elsktor s.

For correct operation both the microprocessor IC1 and the peripheral interface adapter Cmputer have to be initialised. It was very successful in that period, due to its low price following from the inexpensive and easy-access expandability.

Care should, of course, be taken to ensure that the diodes and electrolytic capacitors are mounted with the correct polarity.

Board on a Eurocard PCB. If pushing down on the IC causes correct operation, then this is almost certainly the case. When the board has no embedded components it is correctly called a printed wiring board or etched wiring board. The data bus lines are arranged so that the first half four bits of the data is in IC4 and the second half is in IC5.

Additionally, the seventh segment bisects the rectangle horizontally, there are also fourteen-segment displays and sixteen-segment displays, however, these have mostly been replaced by dot matrix displays. If it is more convenient, the display can be mounted at some remote location. 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.

A personal computer can hunior 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. However, this is not to say that communication is limited to these.