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...
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whipaway
Jan 8, 2009 8:21 pm
That's good information to know! Maybe you should do a writeup on the modification and place it into the files section. prof_stark <pastark@...> wrote:...
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Granz
granz_consult
Jan 9, 2009 7:26 am
Prof, Excellent! Great idea. I also used to teach using the ET-3400, and got my own a while back. I am currently saving up the parts to put 32K RAM, 8K...
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prof_stark
Jan 10, 2009 3:07 am
Hi Art - nice to see someone still interested in the old '70s 6800 stuff! I also had a SWTP back in those days, followed up with a 6809 and then 68000 system....
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prof_stark
Jan 10, 2009 10:14 pm
... the files section. There isn't much to say - if you bend up the appropriate pin of the IC (and only that one), it will decode that range of addresses. For ...
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john_crane_59
Jan 11, 2009 8:12 am
... and got my own a while back. ... (with MikBug compatible Serial I/O) on a PCB and porting MikBug to my ET-3400 in 1K of the EEPROM.(have RAM, EEPROM,...
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Granz
granz_consult
Jan 12, 2009 2:41 am
Prof, Pretty cool. It has been pretty crazy here (kids just went back to school). I have a bit of work that I need to do on my new book (intro to...
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nhtome
Jan 30, 2009 4:34 am
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,...
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whipaway
Jan 30, 2009 11:18 am
The parts list can be found in the files section, EE 3401 Part 1, TOC.pdf, last page(10). nhtome <nhtome@...> wrote: I've...
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nhtome
Jan 31, 2009 3:20 am
Wow, don't remember the PIA 6820 in the kit. Is it similar to the 6520 PIA used in the C-64? If so I can rob one from one of mine, as they are hard to find. If...
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prathersacres
Feb 16, 2009 4:50 am
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...
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kevin asato
kc6pob
Feb 16, 2009 5:51 am
Take a look at the files sections for EE-3401, parts 1 and 2. The manuals have an intro to microprocessors and then drills down to the 6800. Assembly language...
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erd_6502
Feb 19, 2009 7:02 pm
... I think you are mixing up several chips here... there are a pair of 6526 CIAs in the C-64, but the 6520 did appear in the PET and is very much compatible...
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Roy J. Tellason
rtellason
Feb 19, 2009 7:30 pm
... Yup. I have lots of 6526s, and 6522s, if anybody needs some, along with a whole lot of other salvage/NOS from the c64, 1541, etc. -- Member of the...
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fredcalcul
Mar 14, 2009 1:42 pm
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...
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whipaway
Apr 7, 2009 10:23 am
From this point on, any new members that join this group will automatically have their messages moderated and reviewed before being able to post....
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Michael
mcrawford01
Apr 30, 2009 9:21 pm
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...
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Michael
mcrawford01
Apr 30, 2009 9:22 pm
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...
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Ethan Dicks
erd_6502
Apr 30, 2009 9:28 pm
... The external peripheral I know of (but do not own myself) is a memory box, but there's no reason you couldn't add more than just memory. To talk to a dumb...
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whipaway
Apr 30, 2009 9:35 pm
Check the ET-3400 schematics in the FILES section for the pinouts of the expansion connector, which would allow you to connect to an ETA-3400. The schematics...
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Ethan Dicks
erd_6502
May 1, 2009 12:34 am
... I am incorrect - the buffers are above the 40-pin connector. The chips below the connector (U1 and U2?) are at least a 7442 (1-of-10 decoder) and...
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craig richardson
crichardva
May 2, 2009 10:52 am
Here's a link to the monitor listing online. Perhaps it doesn't cover the 3400A...not sure, but it's a start. ...
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granz_consult
May 3, 2009 2:20 am
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...
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granz_consult
May 3, 2009 2:43 am
Oh, I forgot to mention that if you do not have any of the resistors and do not need a large supply, it may be better to get a resistor assortment kit (103166...
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Michael Crawford
mcrawford01
May 3, 2009 11:28 am
A misunderstanding I expect. I;m from Intel world, so perhaps it is my background that is screwing me up. I am not running tiny basic or a terminal connected...
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Michael Crawford
mcrawford01
May 3, 2009 11:29 am
Here is the promised first cut at what I have been able to learn about the FC00 ROM "built-in" subroutines....
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whipaway
May 3, 2009 11:46 am
There might be more ifo here: http://www.classiccmp.org/dunfield/heath/et3400.pdf...
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Michael Crawford
mcrawford01
May 3, 2009 11:22 pm
Here is the final version of the file describing the Et-3400 "FC00 ROM" display subroutines. I've taken this as far as I can.  Perhaps one of the admins...
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Michael Crawford
mcrawford01
May 3, 2009 11:24 pm
Here is the final version of the ET-3400 "FC00 ROM" subroutines for manipulating the hex displays.  This might be useful to anyone who wishes to generate...
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whipaway
May 3, 2009 11:29 pm
I'm not seeing the images, can you resend as a pdf?...
