View Full Version : Improvised power supply for VT100

December 29th, 2010, 05:35 PM
We had some discussion in the Hardware Support section of this Forum about replacing a failed VT100 power supply with available components.

Mine is working fine now, so I have put up a blog entry describing the project and some particular issues that it threw up, with links to photos and circuit diagram, in the blogs section of this Forum.

DEC had a penchant for unique proprietary components that are becoming "unobtanium", so sometimes we have to set aside restoration purism and improvise something that will just do the work.


[Anyone who looked for the blog from 29 Dec - SORRY I neglected to change the publish status from DRAFT to PUBLISH NOW. It is properly published as of 1 Jan]

January 6th, 2011, 06:55 PM
Absolutely beautiful. Thanks very much for providing the details on this one!

February 18th, 2011, 12:37 PM
Lots of great details in this one. Thank you for posting.

I've been thinking along these same lines in case any of my BA-23 box supplies fail. [substituting a modern ATX supply]

One question... Where did you get your VT100 technical info?

I need to get the same for my VT103... back in the day, they too were known for "weak supplies".

March 17th, 2011, 04:29 PM
Sorry I was slow to return to this thread.. busy elsewhere.

By now you may have already found the wonderful Bitsavers.org.

For VT103 - http://www.bitsavers.org/pdf/dec/terminal/vt103/ has technical manual

March 17th, 2011, 08:09 PM
Yes, I did find that... thank you.