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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Changing the pin layout produced the “lawsuit-friendly” The term PCB is used both for bare and assembled boards.
The display consists of six seven-segment LEDs and shows address and data information, again in hexadecimal form.
Elektor Junior Computer – Wikiwand
It is better to be safe than sorry. As far as the JC is concerned, the outside world is everything beyond the keyboard and display. Established in by the Government of Kerala, it is the second engineering college in Kollam district the fourth engineering college under the aegis of the state government’s Institute of Human Resources Development in Electronics. Junilr the voltage between pins 13 and 7 of IC8 pin 7 is negative and pin 13 is positive.
Usually, the four left junikr displays Dp1. Zero bus turnaround — the turnaround is the number of cycles it takes elekyor change access to the SRAM from write to read Although small in size, the JC has plenty of programming power, which makes it ideal for use by amateurs and professionals alike.
If a key is depressed while one of these outputs is high the code for that particular key is passed to the CPU via port A. This amounts to 64 k — not the 65 k mentioned earlier, due to the fact that all the numbers have been rounded off. A DIN connector on right side.
Elektor Junior Computer
Both types of devices have a Chip Select! Each regulator IC has its own set of capacitors, C2 … C13, to ensure the necessary decoupling. Home computers Revolvy Brain revolvybrain. That completes the mounting of components on the bottom side of the board, and now it is the turn jumior the keyboard side.
A single floppy-disk controller board can support up to four disk drives. This step is optional. First article about the german Junior May June article September article October article Januari article. The only other switch to be mentioned is the display turn-off switch S Card dimensions and template are decided based on required circuitry and case of the PCB, the positions of the components and heat sinks are determined 6.
Since the charge gradually leaked away, a pulse was applied to top up those still charged. It is also used to select either normal operation or step-by-step program development. DIN is a DIN standard for electrical connectors that are widely used in rack based electrical systems. Mount but do not solder the display board onto the main board.
The PIA is disabled regardless of the condition of the other inputs when K6 is high.
Elektor Junior-Computer Buch 1 (German)
This only tells you that the diode is a good one, it does not tell you its polarity. PB4 from port B. External interfaces on the board were often limited to elektot single RS or current loop serial port, so a terminal, printer. This facility can be used when the CPU has to do something else at the same time as data is being transferred through one of the ports. The bit assignments of port elekror, Many mutually incompatible floppy disk formats are possible, aside from the physical format on the disk.
If the display has the above, the next section can be skipped and you can move on to the mechanical assembly. More articles were published in magazines like Kilobaud Microcomputing that described home-brew software and hardware for the KIM-1 than for other development boards, today some chip producers still release test boards to demonstrate their cpmputer, and to use them as a reference design.
It was delivered as an electronic kitor could junoir as two printed circuit boards main board and Seven-segment display board only, for components to be installed.
It was developed by the German engineer Loys Nachtmann. Conductors on fomputer layers are connected with vias, multi-layer PCBs allow for much higher component density.
A minimal PCB with a component used for easier prototyping is called a breakout board.
A programmable timer can also be seen in the PIA block in figure 2. Both Intel and Motorola had juniorr announced a price for a single microprocessor. Clock signal frequencies ranging from kHz to 4 MHz were very common at this time, the design complexity of CPUs increased as various technologies facilitated building smaller and more reliable electronic devices 2.
The small quartz window admits UV light for erasure. Bennett hired Chuck Peddle in to do architectural work on the family products already in progress. Presence of a voltage on this gate creates a channel in the transistor.
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.
The PIA is such a versatile and multi-functional device that we could quite easily write a whole book about it, but as far as this chapter is concerned, enough is enough. The word data has a broad meaning here as it also includes address information. As it is not likely elektog be needed just yet, the 64 pin expansion connector can be installed at a later date. Of course, data can only be transferred in one direction at a time.
A typical 7-segment LED display component, with decimal point.
1. Getting acquainted with the ‘Junior Computer’
elekyor There are also three buses that go to the outside the three arrows pointing right in figure 2 but these are for future expansion of the system rather than communication with the outside world. It seems reasonable to point out at this time that when information is junioe from memory, that information is not lost.
Each bit of the word is a 1 or 0, depending on the transistor being switched on or off. Member feedback about Elektor Junior Computer: However, this is not to say that communication is limited to these. For correct operation both the microprocessor IC1 and the peripheral interface adapter IC3 have to be initialised.