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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compuetr A MOS Technology advertisement highlighting their custom integrated circuit capabilities. A detailed version of the block diagram in figure 1, this time with a specific computer in mind: For humans to be able to understand what the computer has to say, and vice-versa, some form of translation medium has to be incorporated.

Junior computer Paperware 1 — source listings Junior 2 — source listing floppy drive bootloader 3 — universele terminal 4 — aansluiten VDU kaart met dank aan Ruud Baltissen. As can be seen from the block diagram in figure 1, a micro computer consists of three basic sections. It seems reasonable to point out at this time that when information is read from memory, that information is not lost.

Modern microprocessors appear in electronic devices ranging from automobiles to cellphones, the so-called Harvard architecture of the Harvard Mark I, which was completed before EDVAC, also utilized a stored-program design using punched paper tape rather than electronic memory.

Like the display board, the construction of this board should not present any problems. Together with the bytes of IC4 and IC5 this gives a total of bytes more than enough for the budding amateurs. These are, Data port Main status register Control port The first two reside inside the FDC Junioor while the Control port is in the external hardware, the addresses of these three ports are as follows.

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The switching state of the transistor is controlled by the voltage on the control gate of the transistor. Board on a Eurocard PCB. 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. Download here the archive. Motorola started the microprocessor project in with Uunior Bennett as the main architect, the chip layout began in latethe first chips were fabricated in February and the full family was officially released in November It also served users of the microprocessor as a method to prototype applications in products.

The track pattern of the lower side of the main board. No puff of smoke? The circuit diagram of the Junior Computer is shown in figure 4.

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

Its output slektor be fed onto the address bus in order to have access to the memory for the retrieval of program instructions. When the high voltage is removed, the electrons are trapped on the electrode, because of the high insulation value of the silicon oxide surrounding the gate, the stored charge cannot readily leak away and the data can be retained for decades.

It was developed by the German engineer Loys Nachtmann. The hard part was loading the BASIC from cassette tape—a minute, rockwell International—who second-sourced thealong with Synertek—released their own microcomputer in one board inthe AIM As can be seen, the limit for 4 lines of binary data is reached with only sixteen combinations, whereas with a normal base computsr count ten thousand combinations are possible 0.

The wires can now be soldered and any excess lead length cut elektoe.

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.


The address bus informs the PIA which port, which direction, and whether or not to hold outgoing or incoming information. As it is not likely to be needed just yet, the 64 pin expansion jnior can be installed at a later date. See here the description and circuit design.

Elektor Junior-Computer Buch 1 (German)

Starting from the diagram the component pin pads were laid out on the mylar. Last, but by no means least, is the control bus. 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.

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 the EPROM is decoded and used to connect one word of storage to the output buffer amplifiers. 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. The keyboard and display are connected to the computer via ports A and B.

The keyboard is next, along with D2, Care should be taken when installing the key switches, they should lie flush with the printed circuit board. Later printing terminals such as the DECwriter LA30 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.

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