The comment implies a question about how to troubleshoot the unit. If I understand correctly that the ET-3400A is very similar to the ET-3400, the built-in...
Check your voltages and the state of the reset pin. The reset pin should not be a logic zero (< 1.5VDC). After that, the state of the address and data line...
Yes, please do. ... From: jameskarpy <jkarpy@...> Subject: [ET-3400] I have an ET-3400A schematic To: ET-3400@yahoogroups.com Date: Sunday, September...
Wasn't "too" hard to get most of it working. Kinda looks like a bit of a spiders web.. I replaced the SRAM's with 1 8K SRAM, and the decode logic prom with a...
SOUNDS LIKE A IMPRESSIVE REBUILD! Â Â Â I wish I could be of some help here but only yesterday I received th ET3400 I purchased off e-bay and am eons away...
Hey, Just bumping this as a reminder, or if anyone else already has the images of the u105/u106 roms from the ETA-3400 (terminal/basic) then please upload...
Hello again, Thanks again for your reply. In checking the clock crystal, I noticed a blank, unsoldered area underneath the board. Upon further investigation, I...
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...
Hello, Thank you for your reply. I took a closer look at the output (which is only printed during the serial test, so we can rule out the cable). The...
Dear Antony; You indicate that "my computer just displays garbage". Is the "garbage" consistently the same characters and repeated as well? If so, there may be...
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'm not sure if this was intended as a correction, but the multiple voltages I discussed was during programming, not operation mode. He was asking if a...
I would like to offer a few comments to the information already provided. First, let me offer a correction: for read operations the 2708 does need three...
I have a Data I/O 212 eprom programmer and a sleeve of 2716s, if there is enough interest, I can program up a bunch of proms for anyone that might need them...
A little late of a reply, The dual power willem is "supposed"; to work, but I really don't trust that it does, the older eproms (2708/2716/2732) need the 3...
I might be able to read the eproms this weekend and post them to the board. ... From: eytankaziberdov <eytankaziberdov@...> Subject: [ET-3400] ETA-3400...
Hi All, I found an ETA-3400 a while back, it had just the circuit board with all the socketed parts removed.. I had pretty much re-assembled the whole thing...
... I just bought an ET-3400 and I think that having EE-3401 available electronically will be really helpful. I bought the ET-3400 off E-bay. It's surplus from...
Hi Leo, Yes, I was able to download your .zip files, quite a savings in file size compared to 5 MB! But, isn't it easier to just get my .dmp file? Also, I...
Hi Dan, Paper Tape Punch !!!  How about that...Memories....  Years ago I bought several Heathkit PT Punches. At that time I had a ET-3400 (and later a...
Hi Leo, Yes, its a learning experience. That's what keeps us coming back. I looked up the Willem EPROM Programmer and it looks like a great buy. Maybe it...
Ok...making a zip file was easy..... I uploaded to the files the 3 screen shots from the Willem programmer. I belive they give a complete list of what is on...
Hi Dan, Thanks for the info. The .ptp file loads into the Willem programmer but the info that is read is not the Eprom data. I think the programmer needs a...
Hi Leo, I just created a folder and uploaded 4 text files. They are a source listing and assembler output files, and also a memory dump of the ET3400 ROM. The...
Any and all files pertaining to the ET-3400(A) are welcome. Please upload! ... From: Leo <lcr_retired@...> Subject: [ET-3400] Uploaded files. ET3400...
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...
