AR 8/600: Build log #5

Posted in Electronics, Relay Computer with tags on January 12, 2014 by Murtaugh

I did not die. Here is another update to the relay computer:

Finished Control Unit, PSU and pretty much everything. In this post I will show only the CU and PSU, and when I get the time I will make more videos and take some photos of the whole machine.

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AR 8/600: Build log #4

Posted in Electronics, Relay Computer with tags , , on October 22, 2013 by Murtaugh

Finally, after a long time, the Program Counter and the 16-bit register unit are ready. I also received the cabinet from the smith.

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Relay Computer: Build log #3

Posted in Relay Computer with tags on August 3, 2013 by Murtaugh

After a whole month of work, soldering and debugging, the ALU is ready.


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Relay Computer: Build log #2

Posted in Relay Computer with tags on July 1, 2013 by Murtaugh

This week I finished assembling the 8-bit register unit. It has four 8-bit registers, A, B, C and D. Registers B and C are used as ALU input.

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Relay Computer: Build log #1

Posted in Relay Computer with tags on June 17, 2013 by Murtaugh

Here is the first finished part of the computer: the control panel. It is the user interface to the machine: from here it is possible to enter data to the RAM and registers, control and monitor the execution of programs and reset the CPU (empty all registers).

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Relay Computer: Build log #0

Posted in Relay Computer with tags on June 8, 2013 by Murtaugh

Why the heck would someone build a computer using obsolete technology when you got computers that are hundreds of millions times faster? Firstly because I always wanted to know how computers work. In the past, I have built simple adding machines, clocks and even tried to build a Z80 computer from scratch (which was a failure only because I got the schematics from 1979~1985 “Nuova Elettronica” magazines, and I couldn’t find many of the parts for sale, mostly because they were no longer fabricated). And secondly, for fun. Having such a monumental task in my hands, something to work for a lot of time and “keep my mind from wandering”. Also, having the experience of listening what a computer is thinking, is something really amazing.

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Siemens Echo Encephalograph Teardown

Posted in Electronics with tags , on June 3, 2013 by Murtaugh

In early 2012, I bought a very peculiar machine from a friend, who bought it from the junkyard. After looking inside, there were some seriously damaged circuits, so I thought it was not worth restoring it. The best decision was to tear the machine down to reuse the – extreme good quality – parts. I took several photos of the process, but I will only publish the best ones.

Completely dirty.

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