Date: Sun, 20 Apr 1997 12:24:55 -0600 (MDT) From: Wes Peters <softweyr@xmission.com> To: grog@lemis.de (Greg Lehey) Cc: questions@freebsd.org Subject: Re: weird cable Message-ID: <199704201824.MAA07857@obie.softweyr.ml.org> In-Reply-To: <199704150201.LAA00629@papillon.lemis.de> References: <199704141141.VAA27032@genesis.atrad.adelaide.edu.au> <199704150201.LAA00629@papillon.lemis.de>
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grog@lemis.de writes:
> Michael Smith writes:
> > Christoph Haas stands accused of saying:
> >> On Mon, 14 Apr 1997, Michael Smith wrote:
> >>
> >>> If you want to _interface_ it, then you are going to have to write your
> >>> own keyboard interface driver, and you will need a logic/RS-232 level
> >>> inverter.
> >>
> >> So a SUN uses a simple RS232 interface to attach its keyboard ?
> >
> > Yup, like many sensible workstation vendors, a real, async serial
> > protocol. None of this clocked bidirectional two-wire sync crap 8)
>
> Wouldn't this make it more appropriate to connect to a serial port,
> then? That way you'd save on the logic glue.
Not quite. I think it's more like a multi-drop RS422 serial bus,
since the mouse, keyboard, and other devices are all plugged into
it, with the mouse always being last since it has only *one* port.
The specs for the "Sun Desktop Bus" are essentially the same as
the "Apple Desktop Bus", I've heard the two are even somewhat
compatible. I've never tried it myself; my Sun type 5 keyboard
would certainly make my old Mac LC-II at work more livable. ;^)
I believe Sun publishes specifications for the SDB, have you tried
contacting them or poking around www.sun.com for more information?
--
"Where am I, and what am I doing in this handbasket?"
Wes Peters Softweyr LLC
http://www.xmission.com/~softweyr softweyr@xmission.com
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