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 > > -- Christian Dirks Toast_r_at_Idealine.info Vorster Str. 66 47918 Tönsivorst 2. Stellv. Vorsitzender Verein zum Erhalt klassischer Computer e.V. http://www.classic-computing.de/
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