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This mini forum is intended to provide a simple means of discussion about the Heathkit / Zenith  ET-3400 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


Saturday 9th March 2013
Andrew L Ayers (USA)

Just picked up one of these trainers today at the Scottsdale ARC Hamfest$ got the trainer and a few mostly-complete "courses" (the trainer itself had some extra parts and whatnot on the breadboard, with wires running to various sections). I''ve been scouring the web looking for more info and such, and have found quite a lot. I found a PDF copy of EE-3401 - I''m looking for PDF copies of EE-3402 and EE-3405$ does anybody have ''em?

Sunday 25th September 2011
Michael Wagg  (United states)

I currently have a complete set of the et-3400 manuals with tapes records and schematics on sale on eBay! They are in great condition. I have schematics as well as all Tests!

Saturday 10th September 2011
Tim Niles (Minnesota)

Would anyone on this topic know someone who owns the microprocessor continuing education manuals? I just sold the two manual set and the buyer discovered a couple of missing sections which I would rather replace somehow than just refund.

Any help would be greatly apreciated.

Sunday 4th September 2011
Dave Harvey

Two more training courses which required the ET-3400 were the Voice Synthesis Course EE-3403-A and the 6809 Microprocessors Course EE-3404.

Sunday 9th November 2008
whipaway (USA)
Heathkit ET-3400 Resources

Resources for ET-3400:

Monday 25th August 2008
Kevin Sayler

My kit came with 512 bytes of RAM, Looking at the schematic and part $s, I noticed that they were 1K x 4 RAM chips. A bit of rewiring doubled my kit''s memory

Sunday 22nd April 2007
whipaway (Paisily Ppark)

i have PDF files that show the modification, with diagrams.

Monday 12th February 2007
Luposian (USA)

I have a Heathkit ET-3400A, based on the 6808 CPU. I am thinking about upgrading it to the expansion connector, but the instructions aren't very clear and I'm not sure where it would show a visual on the assembly/wire-up for this connector. Can you help in this regard?

Friday 17th October 2003
Martin Hultén Ashauer (Sweden)
Paeron's Place

Me and my friend scored bigtime! I for a long time admired a ET-3400 computer located in a locker in one of the classrooms at my school. So one day my teacher told me that i could borrow it (this was like 2 weeks ago). Then after I had asked around a little another teacher led me and my friend to a classroom and opend a big cardboard box and lo and behold it containd over 10 more or less working ET-3400s. Then he went over and opend a locker and took out a fiew manuals, schematics and reffernce books. So on this monday (October 20:th 2003) my friend will get a car and drive home them beatifull blue boxes. Our joy is almost infinite!

Wednesday 6th August 2003
Randy (Pittsburgh, PA)

I have 3 of these ET-3400s in various states of disrepair. I also have extra parts. What I need is a schematic, manual and EPROM image.
Will trade a system for these items.

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