Why impossible?  I've implemented full asynch. serial send and receive at
    38.4k using an SX (hope that's not a forbidden term on the PIC list <G>).

It's not forbidden, but it's also not a fair comparison, since you're
talking about a cpu that's 4 to 20 times faster...  There's a ram-based
microcodable engine inside a cd2481 that easilly handles 4 ports at
115200bps, plus dma to a host processor, but that wouldn't be a fair
comparison either.

I think a faster-than-19200, half-duplex, semi-synchronous async bit-banging
driver tends to need to come with so many warnings and caveats that no one
is particularly proud of having written one.  You'd think there would be
enough uses that there would be more of them, though...

BillW

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