Author Archives: rjarratt

DECstation 220 Update

Posted on August 13, 2017 by rjarratt

Previously I reported that I am now getting corrupted video out of the DECstation 220. I have spent the last couple of weeks trying to understand the problem, checking the tracks to all the chips in the battery-damaged area, on both … Continue reading →

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DECstation 220 Now Getting Corrupted Video

Posted on July 31, 2017 by rjarratt

I am now getting a corrupted video pattern on the DECstation 220 Continue reading →

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DECstation 220

Posted on July 27, 2017 by rjarratt

Some time ago I collected a DECstation 220. This is the machine that succeeded the Rainbow. It uses an Intel 80286 processor and is DOS compatible. Mine, being a European version, has Olivetti parts inside. The person I got it … Continue reading →

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DECstation 5000/240 Progress

Posted on July 19, 2017 by rjarratt

I have made a lot of progress in getting my newly acquired DECstation 5000/240 going again. Before doing anything I took it apart and opened up the power supply to inspect the electrolytic capacitors. They all looked fine. I then … Continue reading →

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DECstation 5000/240

Posted on July 15, 2017 by rjarratt

My latest acquisition. A DECstation 5000/240 with a TURBOchannel Extender. Continue reading →

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Rejuvenating This Site

Posted on July 5, 2017 by rjarratt

For some time now I have been thinking of updating this site, and actually documenting more about my collection. The impetus came recently after I started working on an emulator for MU5 and I needed a home for information about … Continue reading →

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RetroChallenge 2012 – Designated Router

Posted on July 31, 2012 by rjarratt

Did the work tonight to make the router become the Designated Router and send the Ethernet Router Hello message to the All End Nodes address when it is the designated router, and to stop doing so if it stops being the … Continue reading →

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RetroChallenge 2012 – Refactoring

Posted on July 29, 2012 by rjarratt

I have been away a bit and not had my development environment available to carry on, so I decided to do some refactoring and attempt some other small but important changes while I was away. The changes were to add … Continue reading →

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Retrochallenge 2012 – Adjacency Staying Up

Posted on July 7, 2012 by rjarratt

I have been cleaning up the code and checking the specification for the Ethernet Router Hello message to make sure I have implemented it fully. In doing so I realised that I was not setting the router information in the … Continue reading →

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Retrochallenge 2012 – Adjacency Up

Posted on July 4, 2012 by rjarratt

I have been working on the Ethernet Router Hello message. After fixing some problems with the lengths I was putting in the message I finally worked out why my simulated VAX780 was not “seeing” my router node. It was because … Continue reading →

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