Monthly Archives: April 2020

VAXmate H7270 PSU Fixed, But No Video

Posted on April 18, 2020 by rjarratt

In previous posts I have been describing my attempts to find a fault in the H7270 power supply of my VAXmate. After a long time studying and testing it I finally found the fault. It was a shorted diode (marked … Continue reading →

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Partial Re-cap of H7109-C PSU for a VAXstation 4000 VLC

Posted on April 6, 2020 by rjarratt

Recently I had occasion to dig out one of my VAXstation 4000 VLC machines. Before using it I decided it was prudent to check the power supply, a H7109-C, to make sure there were no leaking or bulging capacitors. It … Continue reading →

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Memory for a DECstation 2100

Posted on April 4, 2020 by rjarratt

Recently I bought a set of 8 memory modules that were advertised as “DEC VS4000”. They had a part number of 50-19464-02. This is one of the modules: I had assumed this was for the VAXstation 4000 VLC, but it … Continue reading →

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