g4ugm
Senior Member

Originally Posted by g4ugm

Well I have started fiddling with a PC/Server 500 with P390 mainframe card. It came with a duff VGA card which I replaced and then the fun started. It reports duff RAID config and won't boot. It also refused to read any floppy disks so I couldn't even start to debug.

Sadly it has a "Media Sense" floppy disk drive so I couldn't try another drive. Fortunately a cleaning disk from E-Bay that arrived yesterday seems to have restored some functionality and I can read many disks,

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Well I collected a P390 on Thursday. Its a large (huge) IBM Microchannel server with a RAID controller and IBM Mainframe CPU Card. Also got lots of other bits. Will post some photos here...

Now have it re-assembled after finding the missing bits that had rolled under the desk was fun.. Here is a very short Video on YouTube..

http://youtu.be/ogplYeEYzu8

just need to make a dedicated 100V PSU...

Well tonight I added an interface lead from the spare contacts on the integrator switch to the plotter. This allows the plotter sweep to be started when the TR-10 is switched out of "Reset" mode.

Wired up the TR-10 to produce sine and cosine by solving

dx/dt = y
dy/dt = -x

which have the solutions "sine(t)" and cosine(t)". These can be plotted against time to produce a sine wave, or against each other in x/y mode to

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OK well I now have an old Pen Plotter , analogue of course attached to my TR-10. I was going to post a short video of it plotting negative exponential... But it says its too big, so here is a photo of the output.

Attachment 22499

OK Uploaded video to YouTube

https://www.youtube.com/watch?v=z07eV_QIhyY

So you can watch...