10 October 2020 at 12:36 #9674
I also added an auto-reset circuit controlled by the DTR signal coming from the USB-serial adapter.
In this way it is possible to have an automatic toolchain to assemble, load and run on target (the 68008 su breadboard) without physically touching the board.
Here a demo with the EhBasic source:
At this point it's time to start thinking about the final card…21 December 2020 at 13:23 #9898
Lately I have had time to devote myself to the final sheet of the 68008. For now I have completed the first draft of the wiring diagram and a first attempt to place the components on a 100x100mm PCB (without any routing for now):
Now the more complex part begins. We'll see…21 December 2020 at 15:20 #9902
The placement of components is sometimes very arbitrary. In fact, one thinks less about it, given the possibilities of using automated programs.
I remember that with the first attempts to make circuits it took me several attempts and sometimes the rule is to follow a path of use, At least you think you can put the connections towards the edges and possibly a sense of inputs and outputs. But then, to overcome certain difficulties, I tried to make the tracks pass between two feet. At the end I used some transfers and a specific squared sheet. It seems to me that it was only a 2,5 mm of square.
I wrote a article for a little development. In fact I was thinking if you might be interested. In fact, I would hope that the Chinese will get the idea for a production module.21 December 2020 at 19:55 #9905
To position the components I use the “ratnest” which allows you to qualitatively assess whether a certain positioning can be critical or not:
As for thermocouples, I read your post but I don't understand what you would like to do.22 December 2020 at 16:42 #9908
Bravo! Also because you have chosen in THT.
It must be said that in order to stay in 10 cm2 it already takes a good job. In my opinion the CPU could be on the left, but I would say you should pick up the Kicad and try it out.
Thermocouples I am writing to you from that discussion…
Aug30 December 2020 at 13:54 #9924
I have completed the PCB routing.
The board allows two main HW configurations: Lite e Full.
With the Lite configuration they serve only 3 integrated to have a working system.
Now a few refinements before sending it all to manufacture…30 December 2020 at 19:28 #9926
I have tried the freerouting and it seems to me that depending on the parameters it does a good job. In all cases it is a masterpiece like Michelangelo's David or Leonardo's Mona Lisa.8 January 2021 at 10:40 #9929
Final version of the… “Gioconda”… It is sent for manufacture:
Now all that remains is to wait and… keep your fingers crossed…
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