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- From: welman@cs.sfu.ca (Chris Welman)
- Subject: SDLC interface to Indigo?
- Message-ID: <1993Jan12.012708.2152@cs.sfu.ca>
- Keywords: indigo SDLC peripheral serial
- Organization: CSS, Simon Fraser University, Burnaby, B.C., Canada
- Date: Tue, 12 Jan 1993 01:27:08 GMT
- Lines: 39
-
-
-
- I have been asked to look at the possibility of hooking up a
- custom-built peripheral to an Indigo. The peripheral box
- currently communicates with a PC via an SDLC serial connection
- running at 182 kBaud (so I'm told); the idea is to replace the PC
- with an Indigo.
-
- SGI sells an SDLC card for its VME-based machines, but nothing
- for the Indigo, apparantly. I've talked to SGI Express, who
- don't know of any 3rd party SDLC boards for the Indigo. Does anybody
- else out there know of anything along these lines?
-
- What about the Zilog Z85130 DUARTs used by the Indigo? Don't these
- things have an SDLC mode they can run in? Is this one of those
- things that might work, but is not "supported"? Some of the #defines
- in sys/z8530.h seem to indicate SDLC functionality...
-
- The man page for serial(7) also seems to indicate that an external
- clock can be provided to the DUARTS. Is this a way of getting these
- things to run at a rate faster than the officially supported maximum
- of 38.4 kBaud? Is there any more in the documentation about this?
-
- If the DUARTs can't be made to handle anything greater than 38.4 kBaud,
- would it be feasible to consider building some "black box" to convert
- the incoming SDLC serial data to something which could be fed in
- through the parallel printer port? Perhaps such a thing
- already exists?
-
- Any and all comments, suggestions, caveats, and/or dire warnings greatly
- appreciated! Is this an impossible task altogether, or is there some
- hope?
-
- Thanks,
- Chris
- --
- ========================================================================
- Chris Welman Simon Fraser University
- welman@sfu.ca (604) 291-3610
-