On Thu, Jan 10, 2019 at 9:11 AM André Fachat <afachat@gmx.de> wrote: > > > > Am 10. Januar 2019 09:01:10 schrieb Francesco Messineo > <francesco.messineo@gmail.com>: > > > On Thu, Jan 10, 2019 at 8:26 AM André Fachat <afachat@gmx.de> wrote: > >> > > > > 65C22 can be still purchased new, I believe mouser has them. I don't > > know if the 65C22 has that bug fixed, but all it takes to fix the bug > > is a 74LS74 in front of the VIA (I remember checking this many years > > ago, si I might be wrong), so it's not such a "big" problem if one > > wants to use the old 6522. > > I know this solution, but IIRC this prevents bidirectional operation > without extra direction control. yes, or (I'm glad I've found the original article) use shift out from the sender end via clock generated on the receiving end. This has no bugs and works without external hardware. Scroll a bit down the forum post that I linked in another mail and it's mentioned. > > > >> > >> After sending I remembered the WDC but they are not plugin replacements as > >> they have active IRQ drivers and need an extra diode. > > > > well, little extra components aren't that bad anyway, if one really > > wants to use the shift register. > > Yes but makes it less easy for unexperienced users. adding the extra HW on a 6522 adapter socket would be easy nowadays. one HCT74, HCT04 and HCT126 can live unnoticed under the 6522 socket. However, it's still not clear where are we going? Making the fastest 1541 on earth that would be incompatible with almost all the loaders, coy programs, demos etc.? FrankReceived on 2019-01-10 10:01:22
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