Elektor Junior Computer

The Elektor Junior Computer was a simple <a href="/facts/MOS_Technology_6502/q9YLwkzm">6502</a>-based <a href="/facts/Microprocessor_development_board/2NHyyloT">microprocessor development board</a> published in the 1980s in the Dutch, German and later French, Spanish, British and Indian versions of <a href="/facts/Elektor/BT3qcmQ7">Elektor/Elektuur</a>, in the form of a series of articles and four books. It was developed by the German engineer Loys Nachtmann.
The books are available in the <a href="https://archive.org/search?query=subject%3A%22Junior+computer%22">Internet Archive</a>.
The Junior Computer was a virtual clone of the <a href="/facts/KIM-1/K16FINul">KIM-1</a>, only it did not use the special I/O+ROM chips (<a href="/facts/MOS_Technology_RRIOT/aAbUx7QF">MCS6530</a>) but rather an off-the-shelf <a href="/facts/MOS_Technology_6532/xrJPYz4p">6532 RIOT</a> and a 2708 1K <a href="/facts/EPROM/kXcEca36">EPROM</a>. It also had a different physical shape, as it used the <a href="/facts/Eurocard_(PCB)/ceeDsokd">Eurocard board</a>, and a 31-pin <a href="/facts/DIN_connector/RwdLDTBC">DIN connector</a> for I/O and a <a href="/facts/DIN_41612/mUaER2X1">DIN 41612</a> connector for system expansion. It was delivered as an <a href="/facts/Electronic_kit/6KuK47Ph">electronic kit</a> or could purchased as two <a href="/facts/Printed_circuit_board/muSR2p43">printed circuit boards</a> (main board and <a href="/facts/Seven-segment_display/4rzfu0q0">seven-segment display</a> board) only, for components to be installed. 
As it was much lower in price than an original KIM, many more Junior computers (several thousands) were used in the Netherlands, Germany and France, than original KIM-1s. 
Later extension boards were developed, and a <a href="/facts/BASIC_interpreter/AbVeR56f">BASIC interpreter</a> was ported.
Elektor expansion boards specifically for the Junior were an I/O interface card (including a <a href="/facts/MOS_Technology_6522/cBDJ4oHR">6522 VIA</a>, a tape recorder interface and a <a href="/facts/RS-232/NCpvGuyq">RS-232</a> port), a VDU (<a href="/facts/Video_terminal/fSlx05qV">video terminal</a>) (an improvement of the previous "elekterminal" design), an EPROM and <a href="/facts/Static_random_access_memory/Pmyo4V5e">SRAM</a> expansion board, a 16/64 KB <a href="/facts/DRAM/koI9FGo5">DRAM</a> board and <a href="/facts/EPROM_programmer/kXcEca36">EPROM programmer</a> board, and a <a href="/facts/Floppy_disk_controller/re4fpWCW">floppy disk controller</a>, as well as a dozen smaller boards for small improvements and interfaces.

Elektor Junior Computer open-in-new

Elektor Junior Computer