Hi guys, I received a brand new (old stock) factory assembled ET-3400A in the mail today with the case all busted up by the US Postal "Service". I got it on...
662
tmatuc
Apr 10, 2012 3:17 am
I am modifying an ET-3400A to use the I/O accessory(ETA3400), is the foil shielding necessary?...
663
whipaway
Apr 10, 2012 10:41 am
The shield will help to reduce radiated EMI that might affect TV and/or other electronic equipment. I personally have never used it and have not had any...
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Rogelio Perea
rogelioperea...
Apr 26, 2012 2:02 pm
Hi there, found about this group looking for information on the ETA-3400. Got a trainer a while ago and became curious to know if any I/O hardware had been...
665
Rob
rwagg...
Apr 27, 2012 3:04 am
At the end of the day, I've never had a board made and haven't put a schematic onto a board. I've Breadboarded my schematic and wirewrapped it with great...
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Jim
ve7uv
May 8, 2012 5:22 am
Thanks for the offers of cases and other suggestions. I ended up using the broken ET-3400 for parts for an Elf II computer I'm currently building. Best...
667
mooshiner2003
May 11, 2012 1:37 am
Jim, I am not trying highjack the thread, but is the ELF the one that was published a few years back?...
668
mooshiner2003
May 11, 2012 1:54 am
Well, I went ahead and got a 3400a off ebay. Anyone sell it to me :-) I have a question about the power switch. Is it a 3 position switch where the center is...
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Jim
ve7uv
May 12, 2012 6:13 am
I'm building a Netronics R&D Ltd Elf II that was originally for sale in the late 1970's for $100 in kit form. On a hunch I called Netronics R&D to see if they...
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David Simpson
djthebear
May 13, 2012 3:43 am
this attachment is for the use of anyone who it may help....Dave To: ET-3400@yahoogroups.com From: ve7uv@... Date: Sat, 12 May 2012 06:12:52 +0000 ...
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Art G. Granzeier III
granz_consult
May 13, 2012 4:58 am
I wanted to let the group know about a new computer museum that I am starting up in the Pittsburgh area. We are still in the startup stage, but hope to get...
672
whipaway
May 13, 2012 12:49 pm
Maybe you could get a local library or university to host an exhibit of some of the items in the collection to stir up interest? ... From: Art G. Granzeier III...
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granz_consult
May 13, 2012 12:58 pm
Great idea there, Whipaway. Some mini-exhibits would take up just a little room and be easier to host. That sounds like it just might work. Thanks, Art...
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John Polson
wb0jdq2002
May 13, 2012 6:32 pm
Art, Thanks for the post. Ah! yes i have been around beyond the intro to the Altair (et-al). I once had the pleasure to visit the store-front operation of MITS...
675
granz_consult
May 14, 2012 4:28 am
John, Thanks for the story. This is a big part of what I am looking for; anecdotes and stories about the early days of computing. Although I have been in...
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Sean
kk4ts_slash_7
Aug 28, 2012 1:34 am
Hi All, Well, the title says it all with this post. I was thinking there might have been a version of rabbits and foxes to run on the ETA-3400, but really I'm...
679
Sean
kk4ts_slash_7
Aug 28, 2012 1:42 am
Gang, I have an old issue of Kilobaud that tells how to buffer eight L.E.D.s to the address lines of a different microcomputer trainer than the ET-3400. I...
680
s shumaker
traveler8811
Aug 28, 2012 5:05 pm
what issue of Kilobaud is it? Would you consider scanning and posting it? steve shumaker ... what issue of Kilobaud is it? Would you consider scanning and...
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kevin asato
kc6pob
Aug 28, 2012 7:27 pm
There is a memory location for the start of the display buffer. The address is available by looking at the sample program listings or demos in the manuals. You...
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s shumaker
traveler8811
Sep 2, 2012 3:55 am
wondering about the Kilobaud article you mentioned... I have a lot of the early Kilobaud mags.  Can you be more specific about where to find it? thanks ...
683
Michael
michaelmerri...
Sep 5, 2012 7:46 am
I reviewed a schematic where the ROM, MCM6830 is substituted with an eprom, a 2716, a 2k x 8 eprom. Besides the different pin assignments, some TTL devices...
684
whipaway
Sep 5, 2012 10:49 am
Offhand, I see no problem with using a 2864 to replace the MCM6830 ROM.I need to revisit all of my ET-3400 stuff, and your idea as well. ... From: Michael...
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Rob
rwagg...
Sep 8, 2012 5:39 pm
When I built the replacement for the EwA-3400, I toyed with the idea of adding an additional ROM socket for the ET-3400 ROM replacement. ...
686
Al
wa9hsl
Sep 11, 2012 10:52 am
Rob, I like the board that you designed and created but I've been occupied with other projects this summer. Minus a printed circuit board I may wire-wrap a...
687
rwagg@...
rwagg...
Sep 11, 2012 1:49 pm
When you say "Relocated the software monitor and Tiny Basic", you mean putting them a different memory addresses? I did not do that, but I did take the two...
688
Al
wa9hsl
Sep 11, 2012 3:09 pm
I think that I understand the compatibility aim now. I orighially thought that you might be running the monitor and TB from a new software address to free up...
689
TonyT
tonytitus
Oct 1, 2012 7:33 pm
I have a Heathkit ET-3400-A Microcomputer I'm putting on eBay if anyone is interested. Fully Functional. I just don't need it anymore. Thanks Tony Titus ...
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Chris Elmquist
zxcvbnm651
Oct 16, 2012 5:19 pm
I see that the ROM image for the ETA-3400 Tiny Basic ROM is out in the files section but I'm wondering if anyone has the source code for this Tiny Basic...
691
mooshiner2003
Oct 20, 2012 10:34 pm
A real nice wooden case either shaped like the original plastic case or even of you own design would be nice. I believe Wozniak built the original Apple ][ in...
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Al
wa9hsl
Oct 23, 2012 12:31 pm
The ROM images were placed out there to help those who might have a Heathkit ET-3400 but needed either the expansion box or a rom/eprom with Tiny Basic on it....
