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About g4ugm

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About g4ugm
NorthWest England (East Pondia)
Old Computers Black Sabbath, Matt Winkworth (and the Winkworthers Originals), Thyn Lizzy, The Mounta



Looking for Analog Computers, Drum Plotters, and Graphics Terminals


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Yesterday 10:07 AM
Join Date
February 22nd, 2011

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Recent Entries

IBM PC/Server 500 - P390

by g4ugm on April 15th, 2016 at 01:10 PM
Quote Originally Posted by g4ugm View Post
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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P390 "Mainframe" Collected

by g4ugm on March 13th, 2016 at 12:27 AM
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...

IBM Model 11 Card Punch

by g4ugm on February 21st, 2015 at 02:28 PM
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..

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

Produced more complex plots on the TR-10

by g4ugm on January 31st, 2015 at 02:58 PM
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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Attached Pen Plotter to Analog Computer - TR-10

by g4ugm on January 28th, 2015 at 03:37 PM
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

So you can watch...

Updated January 28th, 2015 at 03:42 PM by g4ugm