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Category Archives: Retro-Computing
MUSS Source Code
MUSS is the Manchester University Software System. It is an operating system that was designed and built at Manchester University for MU5, designed to be portable, and in fact ported to other machines. In October 2017 I asked the … Continue reading
Posted in MUSS, Retro-Computing
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Another DEC Rainbow 100+
I recently acquired another Rainbow 100+. Here is a picture of it: This came about because a little while ago I was given a Rainbow, and the person who gave it to me had a second one that he was … Continue reading
Posted in Retro-Computing
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More Leaking Batteries
I haven’t been very active lately because I have had to temporarily relocate my collection. While moving it back again I took the opportunity to reorganise things a bit. In doing so I came across the first two PC motherboards … Continue reading
Posted in Retro-Computing
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Update on H7826 Power Supply Repair
It has been a while since I last posted anything about what I have been up to. However, I have been busy trying to find out what is wrong with the H7826 power supply out of my TURBOchannel Extender. I … Continue reading
Posted in DECstation 5000/240, Retro-Computing
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Repair Progress on the H7826 Power Supply
I have been working on the H7826 power supply that came in the TURBOchannel Extender of my DECstation 5000/240. Normally, after a visual inspection, I will just apply power to see if a PSU works. This one, though, was not … Continue reading
Imaging RD51 From a DEC Rainbow 100 Model B
I recently acquired a DEC Rainbow 100 Model B, with a working RD51 disk. The disk is running MS-DOS 2.11. I want to preserve the contents of the disk before it fails. A while back I acquired the MFM Emulator board designed … Continue reading
Corroded H7826 Power Supply
Now that I have got the DECstation 5000/240 working again it is time to move on to the TURBOchannel Extender that came with it. This is in a terrible state, with lots of corrosion all over the place. The worst … Continue reading
Booting VAXen From The Network
Sometimes it is very useful to be able to boot a VAX from the network. The two most common scenarios are Your machine is diskless. As time goes on this is going to be more and more common as SCSI … Continue reading
DECstation 5000/240 Running Ultrix
Having recently fixed the DECstation 5000/240 PSU, I wanted to see that the machine actually runs properly and can run an operating system. I had previously had another DECstation 5000/240, which I had swapped for something else, but I had kept the … Continue reading
DECstation 5000 Model 240 PSU Fixed
I have finally fixed the H7878 PSU from my DECstation 5000 Model 240. When I last posted about it, the PSU was not working very well, it was unable to sustain any load. Following that post I asked for suggestions … Continue reading
Rob's Old Computers 