Date: Thu, 05 Mar 1998 16:18:38 +1100 From: John Saunders <john.saunders@scitec.com.au> To: shimon@simon-shapiro.org Cc: Mike Smith <mike@smith.net.au>, Matthew Thyer <Matthew.Thyer@dsto.defence.gov.au>, current@FreeBSD.ORG, Evan Champion <evanc@synapse.net> Subject: Re: silo overflows (Was Re: 3.0-RELEASE?) Message-ID: <34FE35AE.181C67A7@scitec.com.au> References: <XFMail.980304205551.shimon@simon-shapiro.org>
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Simon Shapiro wrote:
> >> Again, don't decapitate me on this one, but does not the 16550 have a mode
> >> by which it will lower DSR and or CTS when the FIFO reaches a certain point
> >> of saturation?
> >
> > No, it doesn't, although some of the extended versions do.
>
> Brain-Dead. Then all bets are off. In the current software + hardware
> structure, interrupts will be lost.
The CD1440 (I think that's the part number) chip in the smart cards
like Stallion and Cyclades do do automatic CTS/RTS handshaking
with the modem. They also have very large FIFOs. Which means you can
run 256 (yes two fifty six) ports at 57600 in a 486 DX4/100 ;-)
For those that are interested, 4 Stallion 64 port ISA cards.
Cheers.
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