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Author Archives: rjarratt
VT100 External Video Fixed
I have been making progress on restoring the VT100 I acquired some time ago. The RAM is now OK and the keyboard interface is working. However, I was still not getting any output on the screen and I know that … Continue reading
Posted in Retro-Computing, VT100
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VT100 Keyboard Constant Clicking Fault
In my last post VT100 RAM Fault I reported progress on fixing my VT100, getting past a RAM fault, but I left it with a fault where the keyboard constantly clicked the speaker. I knew the keyboard was OK because … Continue reading
VT100 RAM Fault
[Updated 14th October 2023] I acquired a VT100 a while back. It was just the video unit, without a keyboard, but I have a couple of keyboards for my VT101 and VT102, so I would be able to use it … Continue reading
Rainbow H7842 Finally Fixed
I previously posted about the failure of the H7842 power supply in my DEC Rainbow. I reported that after replacing some parts I was getting an overcurrent detection in the -12V output. This was under bench test conditions using a … Continue reading
DEC Rainbow H7842 Power Supply Failure
A couple of days ago, I received a request to format some RX50s in one of my Rainbow machines. So, I got this one out to check that it still works. I was happy that it just powered up fine. … Continue reading
PDP 11/24 Progress
A few years ago I was given a PDP 11/24, followed a few months later by the cabinet and two RL02 drives. Not long after, once I had first tried the PSU with a dummy load, I attempted to power … Continue reading
DEC Legacy 2021 – Windermere, 9th-10th October
After a long wait we finally got to do the next DEC Legacy this weekend. It was started in 2010 and is run on a semi-regular basis and it is something I look forward to every year. There were fewer … Continue reading
Posted in Retro-Computing
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VAXstation 3520
I have just acquired a VAXstation 3520. This is a 2-processor machine, but I got a second processor card with it from another partially complete 3520 to make it a 4-processor machine and really this makes it a VAXstation 3540. … Continue reading
Posted in Retro-Computing
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DECstation 220 Progress and Failure
I recently turned once again to trying to get the DECstation 220 working. I have the original motherboard and a spare one. Both had battery damage and neither one works. The spare actually works less well than the original but … Continue reading
Posted in Retro-Computing
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Bad DSSI RF72 Hard Disk
I have a number of RF72 hard disks. These are 1GB DSSI disks (DEC rather grandiosely called them Integrated Storage Elements, or ISEs). Most of them work well, but I have one that will not spin up. The console firmware … Continue reading
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Rob's Old Computers 