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",...
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...
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...
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...
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...
(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...
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...
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...
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...
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...
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...
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...
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...
Between the power experimenter strip and the keyboard and below the experimentr's breadboard strip are two chips separated by what appears to be the holes for...
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...
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,...
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...
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...
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....
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 ...
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...
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...
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...
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...
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...
