Thread: PDP11/20 demo
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Old 4th Aug 2022, 11:51 pm   #1
Roland Huisman
Tetrode
 
Join Date: Jul 2009
Location: Zwolle (Netherlands)
Posts: 74
Talking PDP11/20 demo

While being active here with my Mullard E7600/4 I saw the old computer section again. Recently I posted a demo on YouTube showing my PDP11/20 and also a demo of my Holborn 6500. I have no idea if this is of any interest here... I guess a few people from here are also active on vcfed.org... But it doesn't hurt to show it here as well I think.

Don't take this one too serious please One can show programmers stuff, I thought I do something different. I hope you like it. And don't mention the way I close the lower RK05 at the end This is not like DEC explains it in the manual...

The PDP11/20 was quite a tour getting it online again.
https://youtu.be/we548QRp7S4

I did a topic about restoring the RK05 drives
https://forum.vcfed.org/index.php?th...ersions.78961/

And A story about the PDP11/20
https://forum.vcfed.org/index.php?th...storing.80723/

I didn't do a story on the TC11 and TU56H unfortunately. But it came don to a few broken TTL chips, two burned motor driver boards, bad capacitors in the H720 power, and the two motor capacitors were bad as well...

I still have to fix my 4KW core memory module, but at least it is complete.

I made the demo of the Holborn 6500 back in 2014 and I though it was horrible when I watched it again. But I never made a new video so I posted it anyway.

https://youtu.be/pOyU_qNV30A

Recently I tested the machine again, but I have to replace some foam pads in the Keytronic keyboard. Oh well, these old beasts will keep you busy...

Regards, Roland
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