Author Archives: rjarratt

Now that I have acquired a DSO (a Rigol DS1054Z), I have been doing more work to understand the failure of the H7270 PSU on my VAXmate that I first blogged about here. I still don’t fully understand the problem, … Continue reading →

While I was using my newly working VAXmate the other day, it suddenly failed. I had left it running for a few minutes and when I came back there was a smell and the machine was not running. I wondered … Continue reading →

I acquired a VAXmate earlier this year. The VAXmate was the successor to the Rainbow. It is PC compatible and runs MS-DOS. It was the first commercial diskless PC, although mine came with an expansion box containing a Seagate ST225 … Continue reading →

In November last year I attended DEC Legacy 2018 and as usual I took along my treasured Teletype Model 33 ASR. I hooked it up as usual to the PDP10 simulator in SIMH to run DEC’s TOPS-20 operating system. You … Continue reading →

Recently I repaired the H7826 power supply in my TURBOchannel Extender. So now I wanted to get it working with the DECstation 5000/240 it came with. The trouble is, I don’t have the cable to connect the Extender to the … Continue reading →

After a spell of concentrating on other things I have finally got round to looking again at the H7826 power supply from my TURBOchannel Extender. When I left it back at the beginning of the year I was waiting for … Continue reading →