Yes, I've seen it and it looks very interesting. It's the main reason why I would want to keep something like this as simple as possible - as an easily hackable alternative based on a simple "shield" and a standard Arduino Mega doing all of the work in software. I think both variants may be useful, as long as this one is kept simple. On the other hand, I've spent all of ten minutes in total looking into this. Maybe it's not very useful after all. I mainly thought it looked cool. :) /Hans On 2020-01-10 15:39, Christian Dirks wrote: > Do you already know the petSD? > http://petsd.net/ > Maybe it's unnecessary to re-invent the wheel. > > Christian > > Am 10.01.2020 um 14:52 schrieb Hans Liss: >> On 2020-01-10 13:54, Baltissen, GJPAA (Ruud) wrote: >>>> Do you know if someone has designed a shield for it already? >>> No idea at all. In fact I had no idea what you meant with “shield”. >>> Now I know that a shield is a daughterboard that fits on the original >>> Arduinoe (or Pi). >> Yes, it makes it far more tidy than building it on a separate breadboard >> or similar. I've just designed a shield for the mega for testing CDP1802 >> processors and it turned out very nice. >> >>>> I'm thinking it should include ... >>> Not knowing how the schematic looked like, I had to download and >>> install Kicad first. I created a PNG of the schematic and if >>> interested, ask me. >> Oh, nice! I only read about the pin assignments in the source code, and >> that sounded easy enough. I can design and test the shield; I just need >> to know what to include beyond the basics. >> >>> First I haven't any knowledge of the Mega2560 at all so I have no idea >>> how the various pins behave: totem pole, OC or something else? What >>> they can drive? Can at least one be used as interrupt input? So that >>> are things I have to learn first. And that will cost time which I >>> don't have very much ☹ >> If it will help to add drivers or something like that, that can >> certainly be done. I don't know anything at all about the IEEE bus. >>> I would certainly include an ATN trap. And why not adding an IEC bus? >>> If possible parallel to the IEEE one. A small LCD screen + some buttons? >> A lot of that will depend on what the software can (be made to) do as >> well, of course. But since it's a Mega 2560 there are certainly lots of >> pins to play with. I'll look for a hardware interrupt pin - that's >> something I haven't played with on Arduinos before. >> >> As for the IEC bus, I'm not sure how to implement that in parallell to >> the IEEE bus. Can that be done with external logic or will the Arduino >> have to implement both? TBH, for now I think I would leave the IEC out >> of it and just get the basic parallel working the way the author intended. >> >> >> /Hans >> >> >Received on 2020-05-30 00:15:07
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