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S > SIGNETICS > Instructor 50


This mini forum is intended to provide a simple means of discussion about the Signetics Instructor 50 computer. If you want to share your own experience or memories, or add relevant information about this system: post a message!

  Click Here to add a message in the forum


Sunday 26th September 2021
Usram (France)

Adress for the Signetics 2650 instructions manual here :

Wednesday 6th December 2017
George (Netherlands)

I''m the proud owner of a Signetics Instructor 50. I got the machine running with an AC power supply, but the heat sink of the old fashioned 7805 got pretty hot, so I switched it off. I don''t have the original power supply unit, but looking at the schematics, I guess it should be 8V AC? In the schematics I see a 5V (DC?) line and an 8V (AC?) line. Does anyone have the original adapter and can info and/or pictures be shared?

I have 6 thick Philips manuals, but they are all in Dutch (no problem for me of course). Happy to share.

Instructional manuals can easily be found through Google, in English.

I saw the post from 2016 in this forum about someone who destroyed the machine by mixing up 110V and 220V (actually it is 230V since 1982 or so...), but actually I don''t understand how that could have destroyed the machine, I''d say only the power supply is gone (or worst case the 7805 and maybe a few other components).

Tuesday 11th April 2017
Nick (Netherlands)

If anyone has manuals, parts or expansions for the Instructor-50 in Europe please contact me, or leave a message here. I''ve got mine up and running but no manuals. Mine came from a lot of 70''s computer hardware from the Philips NatLab in Eindhoven.

Thursday 7th July 2016
Jp (Belgium)

Hello, Again,

I as interested in the 220 Volt version, and you can''t really converted to 110 Volt. Mine died because of it, it came from the US and was converted but the heat sink was enough to fry an egg. So if Thijs (Veldhoven, Netherlands) you still have it let me know. alcanjp at yahoo dot com


Thursday 7th July 2016
Jp  (Belgium)


I am still looking for a Signetics Instructor 50, Mine died
Please contact me at alcanjp at yahoo dot com


Monday 17th August 2015
Alfred (U.S.A.)

I am interested in getting a Instructor 50 if someone has one available.
Please contact me at: cto AT teltrust DOT com

Friday 27th February 2015
Thijs (Veldhoven, Netherlands)

I have a complete instructor 50 including manuals.
Didn''t use it for ages but it should be working.
For anyone who is interested.

Thursday 21st November 2013
Hans (DE)

Little counting error: It got 15 address lines, so capable to addresss 32k (14 would result in 16k). Memory was non continous addressed as 4 pages of 8k each.

Friday 7th June 2013
jp (Belgium)

I have a Signetics Instructor 50 that works, but was converted to work on 220V I am looking for the original adapter for it. Or simply a full working unit.

Friday 7th June 2013
jp (Belgium)

I have a Signetics Instructor 50 that works, but was converted to work on 220V I am looking for the original adapter for it. Or simply a full working unit.

Thursday 13rd September 2012
Simon Favre (USA)

I have one of these. Haven''t done much with it other than fix up the power supply with a regulator. I''m not sure how complete the manuals are, but I do have some.

Tuesday 14th August 2007
James Jacobs (Canberra)
Emerson Arcadia 2001 Central

I am the programmer of Ami/WinArcadia, the most advanced and comprehensive emulators of the Signetics-based systems. I am interested in adding support of the Signetics Instructor 50 and/or Adaptable Board Computer to the emulators. If someone has the relevant documentation and/or dumps of software this would enable the emulators to support these machines. Many thanks.

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