Keeping old computers and electronics alive

Acorn System 4

The Acorn System 4 was similar to the System 3, but in a double height frame, containing fourteen slots in the lower frame, and two floppy disk drives in the upper half of the frame above them. With casing, power supply, and a basic 16K of RAM it was being offered for £1525 in 1982 (again, plus extra for the keyboard)

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AT89C51-8051-8031 SBC
by bprosman
December 27, 2022
Inspired by an old Elektor (Dutch elektronics magazine) design. I designed a new Eurocard form factor design, with buffered outputs , RAM , EEPROM so that it can also fit the 8051 and 8031’s (ROMless).
NDR School television episodes (26)
by bprosman
December 22, 2022
0. Microelectronics - Introduction of the NDR "Klein" computerThomas Naumann and Rolf-Dieter Klein introduce the capabilities of the NDR "Klein" computer and the contents of the 26 episodes. (In German).
RetroSys2019 references
by bprosman
December 22, 2022
NDR Kleincomputer by Rolf-Dieter Klein (For those who speak German) : http://www.ndr-nkc.de/compo/index.htm RC2014 Site : https://rc2014.co.uk/
The Acorn Atom – Introduction
by bprosman
December 22, 2022
The Acorn Atom was my first “Personal computer”, a computer with a real keyboard, and video display (well actually an old portable B&W TV). All I could effort was the basic version, 2K of Memory, no floating point ROM, no printer interface (6522). For many years my own Acorn Atom ended up in a junk... read more »
Stripping Atoms
by bprosman
December 22, 2022
As my 2 Acorn Atom boards were in a quite bad state, and I got a hold of a desoldering station that worked pretty well I decided to strip both boards “to the bone”, and rebuild them with high-quality IC-sockets, low profile crystals etc. (Board images are clickable for Hi-Res).