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1,289 discussions, 9,527 archived comments; pages no longer carry the comments themselves.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ

content/museum/heathkit-zenith-et-3400.md

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+  forum_thread: 766
   photos:
   - title: 'LARGE VIEW #1'
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   - title: Heathkit ET-3400 Resources (Yahoo Groups)
     url: http://tech.groups.yahoo.com/group/ET-3400/
     text: Modifications, schematics, manuals and other resources for the Heathkit ET-3400 Microcomputer Learning System.
-  comments:
-  - author: Andrew L Ayers (USA)
-    date: Saturday 9th March 2013
-    text: 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?
-  - author: Michael Wagg (United states)
-    date: Sunday 25th September 2011
-    text: 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!
-  - author: Tim Niles (Minnesota)
-    date: Saturday 10th September 2011
-    text: |-
-      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.
-  - author: Dave Harvey
-    date: Sunday 4th September 2011
-    text: Two more training courses which required the ET-3400 were the Voice Synthesis Course EE-3403-A and the 6809 Microprocessors Course EE-3404.
-  - author: whipaway (USA)
-    date: Sunday 9th November 2008
-    text: |-
-      Resources for ET-3400:\
-      http://tech.groups.yahoo.com/group/ET-3400/
-  - author: Kevin Sayler
-    date: Monday 25th August 2008
-    text: 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
-  - author: whipaway (Paisily Ppark)
-    date: Sunday 22nd April 2007
-    text: i have PDF files that show the modification, with diagrams.
-  - author: Luposian (USA)
-    date: Monday 12th February 2007
-    text: 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?
-  - author: Martin Hultén Ashauer (Sweden)
-    date: Friday 17th October 2003
-    text: 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!
-  - author: Randy (Pittsburgh, PA)
-    date: Wednesday 6th August 2003
-    text: |-
-      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.
   oc_id: 785
   source:
     url: https://web.archive.org/web/20230510155752/http://www.old-computers.com/museum/computer.asp?c=785