> On 2018-03-15, at 15:59, Gerrit Heitsch <gerrit@laosinh.s.bawue.de> wrote: > >>> The 65xx SID has highly non-linear "opamps". The 85xx fixes that. >>> Not everyone likes it, of course. >> It fixes also the bad clicks during volume change for example. Or is it the side-effect of the above? >>> On later C64 machines the CS line to VIC goes active earlier, >> Is it because they inaccurately emulate the original PLA in a completely different chip? > > The behaviour is the same, but the logic is faster, so you get the output signals earlier in the clock cycle. So from a digitial point of view it behaves the same, from an analog it doesn't Which makes it a different behaviour, giving different (and unwanted) UX, which smells like an ugly bug aka inaccurate emulation to me when the logic I try to argue against is applied. >>> no difference between the 65xx and 85xx VIC here. >> Even sparking aside, the picture is noticeably different. I don't say "better" or "worse" but it is different. > > You get picture differences between the 6569 revisions as well, with the 6569R1 sticking out due to having only 5 luma levels. > > If you go by 'original experience', you have to use a 6569R1 since that's what you got at the beginning... But I don't really want it to be so. I am far from saying that only the "original experience" is the real thing. I don't like R1 VICs. I remember how much I was disappointed when I acquired a beautiful, ceramic one and inserted it into my C64 only to replace it with an ugly plastic one shortly thereafter because I didn't like the R1 output. I don't say that narrow boards are not the real thing. I don't like them but they are still "real", even if "buggy" and "not preferred". My preferred setup is 250466 with 6569R5 and 6581R4. But the other ones are also "real" and not only because CBM slapped its name on it. > Oh, and I'm not going to get an Ultimate-64. Part of the fascination of these old systems is that if they stop working, I can hook up my scope, warm up the soldering iron and fix them myself. You won't be able to do that with the Ultimate. If it stops working, you're SOL. Well - since the content is open-sourced, you can probably repair it faster then the other boards as there aren't that many components to fail/check. True - far from retro-repair-fun but other than that? -- SD! - http://e4aws.silverdr.com/Received on 2018-03-15 21:00:41
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