I'm trying to test out my wire-wrap to make sure I'm as close to reality as possible. I have an original EWA-3400 that I'm comparing against and I'm seeing a...
I've created a new wire wrap of the ETA-3400 replacement with the USB interface but I'm running into a whacky problem and I can't figure it out. It doesn't...
I added USB to the ETA-3400 replacement. I posted two pictures of the breadboarded USB device in the EWA-3400 Replacement folder. I just added the USBMOD3...
As I sit and look at the schematic of the ETA-3400, the cassette I/O functionality does not require much additional effort to add to the current plan. I...
Item number: 370426224794 Starting price is $299.00. It would be fun to build, but not that fun. I'd be interested if anyone from the group is bidding on it....
I joined the ET3400 group today looking for the 1K binary for the Monitor ROM. It looks like there are several versions of it. I also found the source code...
OK, all I did was basically put the ETA-3400 on a breadboard. I posted a few pictures of the unit in the pictures area, but I basically added a new static RAM...
I'm looking for an EPROM Programmer that can also program GALs. I have the Willem programmer and it has worked well for me, but it doesn't do GALs. I've been...
I just uploaded a letter I scanned to the files section. It was included with one of the Educational kits I acquired off of eBay. Check this out, it starts...
Rick, Thanks for the info, that certainly clears things up a lot. So, in the not too distant future we should see a few orders or magnitude increase in our...
Group, The attached 5 MB .zip file contains a recent programming project I did for the ET-3400 that makes interesting patterns on its LED displays. The archive...
whipaway (or anyone else that would like to comment): We are at 96% of our allocated group file storage space (96 of 100 MB), and I can't upload my 3.6 MB...
Hello, I joined this group recently, I have an et3400, recently aquired on ebay. I have wanted one a long time. I had to be satisfied with a Radio Shack...
I see that the "image" of the EWA-3400 Tiny Basic ROM is available here, but I don't know what to do with it. I have an EWA-3400 for my ET-3400 trainer, and...
I took pictures of the ET-3400 and the ET-3400A mainboards this weekend and tried to upload them to the files section. Our files section is full, so I posted...
The ET-3400 uses a mask-programmed MCM6830 ROM. Replacements are practically impossible to get. I am developing a MCM6830 ROM to 2716 EPROM converter that will...
Hi I have been looking through the "files" section and have yet to find a document containing any troubleshooting mechanisms. I have had my 3400 for some time...
I have a ET-3400A and it cannot complete the the early tests listed on the manual. Since nobody ever said the manual has problem, I think my unit needs...
Great news, everyone! Some of you may remember that eBay had an ET-3400A auction recently which included a rare copy of the ET-3400A schematic. I have been...
You can find the manual in one document here: http://bitsavers.org/pdf/motorola/M6800_Microprocessor_Applications_Manual_1975.pdf Lots of other good stuff...
In order to locate my peripherals, ROM and RAM, I needed a comprehensive memory map of my ET-3400A with all accessories. Since it should be useful to others,...
I have two large PDF files I believe would really benefit the group, but cannot upload them due to the 5MB limit. Is this a limit that can be overridden, or...
I feel like bidding on this just to get my hands on a schematic for the ET-3400A. Like to, but won't. Instead I'll post it here for the group millionaire to...
Does anyone have any experience using a simple Symbolic Assembler for the ET-3400? Mostly I'm thinking about the ease of dealing with labels and symbolic...
Does any have any insight in to using a terminal with the expansion interface? I've ran tests on the trainer and the interface by themselves and everything...
