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From: ddj@zardoz.club.cc.cmu.edu (Doug DeJulio)
Newsgroups: comp.sys.next
Subject: Re: Can the Next ports run at 57600 baud RS422?
Message-ID: <1991Jun13.182809.23141@zardoz.club.cc.cmu.edu>
Date: 13 Jun 91 18:28:09 GMT
References: <1991Jun13.152426.20007@neon.Stanford.EDU>
Organization: The Castle Anthrax
Lines: 41

In article <1991Jun13.152426.20007@neon.Stanford.EDU> rit@killdeer.Stanford.EDU (Jean-Francois Rit) writes:
>Can the Next ports run at 57600 baud RS422? This seems to be a
>requirement to drive some printers...
>
>All I could get from the man pages is that zs can run at any of 16
>speeds and that tty speeds are:
>
>     B0      0    (hang up dataphone)
>     B50     1    50 baud
>     B75     2    75 baud
>     B110    3    110 baud
>     B134    4    134.5 baud
>     B150    5    150 baud
>     B200    6    200 baud
>     B300    7    300 baud
>     B600    8    600 baud
>     B1200   9    1200 baud
>     B1800   10   1800 baud
>     B2400   11   2400 baud
>     B4800   12   4800 baud
>     B9600   13   9600 baud
>     EXTA    14   19200 baud
>     EXTB    15   38400 baud

I'm pretty sure the hardware can do better.  I've been wondering about
the possibility of redefining EXTA and EXTB to be something different.
Ideally, I'd like both 56kbaud asynch and 64kbaud SYNCHRONOUS serial
on my NeXT, -- the first for a SLIP connection to a roommate's
Amiga3000, the other for our house's SLIP connection to the internet.
Given those, I'd have no use for 19.2kbaud or 38.4kbaud.

Can anyone tell me anything about the feasability of this plan?  Is
this sort of modification to the serial port device driver something
we can do in a loadable kernel module?  Does anyone know for a fact
what the limits of the hardware are?

Hm, appletalk is really just a very high speed serial line protocol,
isn't it?
-- 
Doug DeJulio
ddj@zardoz.club.cc.cmu.edu