I own an ET-3400A for a while and now I have an ET-3400 on its way. I am just wondering can the CPU and ROM of these units be switchable. Doug...
172
whipaway
Oct 7, 2009 8:46 pm
The pinouts on the ROM are different, so not switchable. The functions of the pins on the CPU are slightly different, I don't remember if they are directly...
173
markh893
Oct 7, 2009 10:21 pm
It's my understanding that the ET-3400 uses a 6800, and the ET-3400A uses a 6808. So no, they aren't pin compatible. The 6808 has a built-in clock driver,...
174
wingon695
Oct 8, 2009 12:13 am
We I do the confirmation test #3 according to the manual, I get the following results: Function Display Expected Display Test Result Reset...
175
whipaway
Oct 8, 2009 12:28 am
Which manual, and which page are these tests on? So, if I understand correctly, you are entering zeros and getting eights? ... From: wingon695...
176
rm.riches@...
rmrichesjr
Oct 8, 2009 1:07 am
Is this part of the test that is on page 39 from the original manual, page 41 of the PDF file? The 'Do' function causes the CPU to execute whatever program has...
177
wingon695
Oct 8, 2009 12:25 pm
The Manual is 1981 Microprocessor Trainer #595-2610-04, page 50, Test Chart #3 step #8. Yes, at step #8 I entered zeros and got eights instead of " -***** " ...
178
rm.riches@...
rmrichesjr
Oct 8, 2009 5:13 pm
Next question: Had you written to RAM the program that accompanies that test? Did that program stick in RAM? Does 'Exam' on the relevant addresses show the...
179
wingon695
Oct 9, 2009 11:49 am
Robert, When I "DO" something, is that means I am writing to the RAM. I did enter "000000". When the 8s shows up, all the keys freeze except the "Reset" key....
180
whipaway
Oct 9, 2009 11:55 am
It appears that whenever you DO something with a 3rd digit, that's when it locks up, perhaps that is a clue to where the problem lies. ... From: wingon695...
181
rm.riches@...
rmrichesjr
Oct 9, 2009 5:48 pm
No. "DO" means you tell the CPU to _execute_ what you had _previously_ written to RAM (or to whatever is at the address you give it). Look in the manual...
182
wingon695
Oct 9, 2009 5:48 pm
Robert I am concluding that the CPU is defective base on my electronics knowledge. I contacted Motorola and they said the last sale of MC68008IP10 was on...
183
whipaway
Oct 9, 2009 5:52 pm
Try Jameco Electronics, they always seem to have older RAM and CPUs available. ...
184
wingon695
Oct 10, 2009 10:21 am
Robert I just try your suggestion. The tests on my ET-3400A manual is page 49 and page 50; Test chart #2 and Test chart #3. The results of both tests turn...
185
millevoy
Oct 11, 2009 1:08 pm
Does anyone know how i can get my hands on a copy of the heathkit 3400 student work book with all the labs....
186
whipaway
Oct 11, 2009 1:11 pm
Check out the EE-3401 folders in the FILES section....
187
hero2000robots@...
hero2000robots
Oct 11, 2009 6:24 pm
Hey does anyone have the blue service book for the et-3400? Kevin Sent from my Verizon Wireless BlackBerry ... From: "whipaway"; <whipaway@...> Date: Sun,...
188
wingon695
Oct 11, 2009 11:59 pm
I am wondering what the blue service book is for. For troubleshooting ET-3400, I just use the initial tests, operational tests and detailed troubleshooting...
189
kevin goodwin
hero2000robots
Oct 12, 2009 12:13 am
I have a full set of blue books for the Hero series robots and the ET/ETA-100. The amount of info in these books allows you to crawl deeper into the systems....
190
rm.riches@...
rmrichesjr
Oct 19, 2009 7:44 pm
Does anyone in the group happen to know of a good 8-bit DAC that works well with the ET-3400 for waveform or limited audio output? Thanks, Robert...
191
whipaway
Oct 19, 2009 8:47 pm
MC1408 or build your own using resistors: http://www.ikalogic.com/dac08.php ... From: rm.riches@... <rm.riches@...> Subject: [ET-3400] any...
192
granz_consult
Oct 20, 2009 5:50 am
The problem with an R-2R resistor ladder network for D-A conversion is that, in 8 bits, the least significant bit is 1/256th of your full-range scale. In other...
193
granz_consult
Oct 20, 2009 5:57 am
Sorry, my mistake: I posted the info page for the DAC0800 (will still work) - the DAC0808 is also an R-2R ladder network, but has some improvements. It is...
194
rm.riches@...
rmrichesjr
Oct 20, 2009 9:46 pm
Art, thank you for the suggestion about the DAC0800/DAC0808 parts available at Jameco. After posting the question, I checked Jameco. Those two parts would...
195
wa9hsl
Dec 1, 2009 2:43 pm
Does anyone have experience with the Heath 6809 modification kit for the ET-3400? I wondered about the keboard software (the FC00 ROM) that apparently is...
196
Rod CurryWood
juandrer1
Dec 2, 2009 5:03 pm
not knowing so much, no. I joined this group because I purchased an ET3400 trainer but I haven't had time ta even take it outta the box! Would love ta be...
197
kevin asato
kc6pob
Dec 2, 2009 6:17 pm
I don't have the 6809 daughter card for the ET-3400/A but have used the 6809 on the job ( a long time ago ). Aside from being a 16-bit uP, it was not too...
198
wa9hsl
Dec 2, 2009 10:36 pm
I've seen these modification kits on eBay and just looked at one on the "Data Professionals" web page as well. I suppose that "worthwhile" is a value that...
199
granz_consult
Dec 4, 2009 12:57 am
Whipaway, Were you ever able to post the binaries for the ETA-3400? I am still very interested, but have not seen either the Monitor nor the Tiny BASIC in the...
200
whipaway
Dec 4, 2009 1:27 am
Very Sorry for the delay, will take post the binaries this Friday or Saturday. ... From: granz_consult <art3@...> Subject: [ET-3400] Re: ETA-3400...
