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· Heathkit ET-3400 Resources
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Founded: May 3, 2007
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Help with ET-3400A
I have an ET-3400A that I built way back in 89. It powers up but all display segments turn on and the "CPU UP" message is not displayed....
Sep 28, 2009
I was given this ET-3400. The the first part of the operational test work out great. Then when I do Test #3,Reset and the readout shows the correct "CPU*Up"
Sep 28, 2009
Memory I/O Accessory Problems...
Hello, I just recently acquired a 3400 Kit and a Memory I/O Accessory. I managed to perform the modification to the 3400 and can interface with the I/O...
Sep 2, 2009
Saving files from ET-3400 to a PC - Cassette replacement
I built this thing earlier this year but I just got around to doing some documentation for it. It works pretty neat. You need to be able to program a PIC...
Aug 31, 2009
Hi, Has anyone used the "Dual Power Willem EPROM Programmer PCB5.0C" pogrammer to program the 2716 eprom?? What is a good programmer to use ??? (Cheaper the...
Aug 14, 2009
EE-3401 has been uploaded to the files section, ENJOY!...
Aug 11, 2009
Uploaded files. ET3400 EPROM INFO
Hi All, I finally purchased a Willem 5.0C Programmer. It works great to Read and Program the 2716/2516 EPROMS and read the older ones. The two files uploaded...
Aug 11, 2009
Part numbers for chips on the ET-3400? Keycap commands?
(I'm new to the group. My wife found a somewhat damaged ET-3400 in the free box at a garage sale, and I'd like to get it running to give to a neighbor kid who...
Jun 27, 2009
Heathkit parts cross reference
This web site might be helpful to those looking to cross reference Heath part numbers into 'normal
39; part numbers: ...
Jun 27, 2009
et 3400 (????)
Hi guys Maybe I missed something as I read all of your nice posts about ET 3400's and ET 3400A's. I have a Heath/Zenith computer trainer that simply says...
Jun 17, 2009
I was wondering if any documentation at all has been found for the 3400a? I bought one at a HamFest this weekend and didn't realize it was the A model. Why is...
Jun 11, 2009
ROM image/schematic for the 6809 upgrade kit for the et-3400 ?
Does anyone have access to the 6809 expansion kit for the et-3400? I'm curious how they interface the 6809 to the original 6800 design (schematic) and what...
May 29, 2009
Terminal Connector Blocks
Does anyone know where I can get the 2-lug or 4-lug terminal strips (or modern equivalents)
? These will be used for a book/kit that I am in the process of...
May 19, 2009
Hi from a new member
Hi all, I just picked up one of the ET-3400s, and I remember playing with one of these long ago. This one was missing the manual and needing some repairs, but...
May 17, 2009
I was wondering if anyone has a handy list (or no where I can locate the correct document) for the ET-3400A monitor ROM's subroutines.
..like outputting bytes...
May 4, 2009
HTML File of FC00 ROM subroutines and associated memory maps
Here is the promised first cut at what I have been able to learn about the FC00 ROM "built-
May 3, 2009
New Database - Unit 10 - Interfacing Experiments, Bill of Materials
My son is in College working on an Engineering degree. He recently read that there is a severe lack of engineers with programing skills. I told him about my...
May 3, 2009
Ships and Connector at bottom of ET-3400/ET-3400A
Between the power experimenter strip and the keyboard and below the experimentr
39;s breadboard strip are two chips separated by what appears to be the holes for...
May 1, 2009
New members' posts now moderated
From this point on, any new members that join this group will automatically have their messages moderated and reviewed before being able to post....
Apr 7, 2009
FS: ET-3400 in working condition
Recently I found my old ET in the garage. It is still working. One key (the "D"
) is missing. It is wired for 220 volts, but there should be no problem to...
Mar 14, 2009
list of parts for using on the proto board
I've poked around here a bit, but can't seem to find a list of the parts for experimenting on the proto board. I've come back to starting over with my rig,...
Feb 19, 2009
Roy J. Tellason
Help for a beginner.
Hi all, I am a retired graphic designer with over 20 years in the field. I am enjoying my newfound free time by learning things I missed during my tenure in...
Feb 16, 2009
I used the ET-3400 many years ago in teaching at a community college, but just recently got my own on ebay. A useful trick that I used back then was to bend up...
Jan 12, 2009
I have to say the ET-3400 is a really cool little machine. Easy to use monitor with LED prompts and mnemonics on the keytops really is good engineering....
Nov 26, 2008
Things are looking up. Thanks to all for the comments on the RF shield. It does put out a lot of RF; but it's not a problem if you're not listening to the ...
Nov 26, 2008
ET-3400A RF shield?
I have an ET-3400A and I'm trying to hookup an EWA-3400. The instructions refer to an RF shield. Is this just a tinfoil cutout? Is it really neccessary for...
Nov 20, 2008
ET-3400A and the 6809 Adapter Module
I have an ET-3400A with the 6802 processor in the white case. I purchased from ebay a 16-bit 6809 adapter module. According to the instructions, since the...
Nov 9, 2008
The new guy
I don't know how active this group is lately, but I would like to ask a question. Before I do, I would like to thank the two folks who posted all the great...
Oct 21, 2008
ET3400 Schematics Posted
Hi All, I just completed scanning and posting a copy of the ET3400 Schematic. There are 4 11x17 pages (the full schematic is a 24x36 "D" size sheet) labeled...
Sep 27, 2008
ET-3400A / ETA3400 Combe available on Ebay
I don't know if anyone is looking for any ET-3400 / ETA-3400 units, but there is a seller on ebay, his ebay ID is: jet*boy He has about a dozen more of the...
Sep 4, 2008
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