Hallo allemaal, I read all those emails regarding the "6525/6526 in a CPLD" problem. But I think you forgot one thing: not all functionality of both ICs are needed. IIRC Michał mentioned in one of our private emails that the timers aren't needed at all. I made a PCB using the ATF1504 but IIRC it can be replaced with an ATF1508. Michał knows all the ins and outs of what is needed to emulate the internal connections. A remark of someone NOT familiar with CPLDs and FPGAs: It is possible one needs a certain number of cells for an input or output of either the emulated 6525 or 6526. But if an output and input are connected to each other, is that still the case? I can imagine that a cell used for an emulated output can be used for the emulated input as well. But AFAIK Michał solved the 8255 problem so the whole discussion is not needed anymore. -- Kind regards / Met vriendelijke groet, Ruud Baltissen www.Baltissen.orgReceived on 2018-06-17 10:01:18
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