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 the first DIY computer project from a magazine? 1974 Elektor 
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Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1226
In May 1974 the German edition of the international hobby magazine Elector (aka Elektuur, aka Elektor) published a series of articles describing a TTL computer.

Various people have sought this design over the years, and after some reaching out to enthuiasts, scans of these articles (from the Dutch edition) have recently been made available - please see attached(*).

Here's a post from the Classiccmp mail list archives:

Quote:
Subject: OT-ish: Build-it stuff / elektor
From: Jos Dreesen
Date: Mon Jun 12 13:02:37 CDT 2006

> Whether it is the chicken or the egg, they also have access to better
> parts stores (for hobbiest quantities) and excellent magazines. The Dutch
> magazine Electuur is translated into English and published in the UK
> every month as Elector. It has excellent construction articles, readily
> available firmware, and even the PCB layout for most of the projects.

Elector is indeed recommended.
AFAIK it also published the first DIY computer : in May '74 they
started a series on a 12 or 16 bit TTL-based computer. That is two
months before the Mark-8.

Those who like to see something special should check it out : it is a
two-address machine, no instructions, but memory-mapped "functional
units". It even had hardware based multiply and divide !

Memory either , at astronomical expense, 2102's or, slightly less
expensive, mos shift registers.

Jos Dreesen

and here's an earlier post:
Quote:
In 1974 Elektor magazine started a series of DIY articles that described an extensible ( 12 bit or 16 bit width ) three address, clockless computer.
TTL based, with a shiftregister based memory. (6 or 8 512x2 shiftregisters .)
An expensive extra wasa 2102 based RAM.
The machine did hardware multiply and divide +
Instructions were build into the address map .i,e, address XX is the adder, adress yy is a shift and so on..

The start of this series actually predates the Mark8 computer !


And here's a more recent thread on gplus, and a query over at Retro Computing forum.

Cheers
Ed

(*) Can't attach - too large! Have attached reduced images of first two pages.


Attachments:
File comment: 1974 Elektuur magazine - TTL computer - part 1, first page
elektor-74-cpu-000-thumb.jpg
elektor-74-cpu-000-thumb.jpg [ 245.28 KiB | Viewed 6451 times ]
File comment: 1974 Elektuur magazine - TTL computer - part 1, second page
elektor-74-cpu-001-thumb.jpg
elektor-74-cpu-001-thumb.jpg [ 191.83 KiB | Viewed 6451 times ]
Sat Mar 23, 2013 9:37 am
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Joined: Mon Dec 28, 2015 11:37 am
Posts: 2
Trying to find the magazine pdf's in the original thread but they seems gone. Anyone still have them around?

Thanx in advance!


Mon Dec 28, 2015 4:24 pm
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Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1226
For now, please see here.


Mon Dec 28, 2015 8:42 pm
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Joined: Mon Dec 28, 2015 11:37 am
Posts: 2
Thank you Ed!


Tue Dec 29, 2015 1:21 pm
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Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1226
If you build one, do please post about it!


Tue Dec 29, 2015 1:44 pm
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Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1226
The German version of this series of articles is available at
https://archive.org/details/Computer74
(as PDF, as images, as e-book, and as a flip-book)


Sun May 28, 2017 5:12 am
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