Path: utzoo!attcan!utgpu!cunews!bnrgate!brtph3!brchh104!brchs1!bnr.ca!rice.edu!sun-spots-request
From: hueni@siam.iam.unibe.ch (Hermann Hueni)
Newsgroups: comp.sys.sun
Subject: 386i: AT-BUS / Floppydrive Interference
Keywords: 386i
Message-ID: <825@brchh104.bnr.ca>
Date: 14 Dec 90 13:27:18 GMT
Sender: news@brchh104.bnr.ca
Organization: Sun-Spots
Lines: 29
Approved: Sun-Spots@rice.edu
X-Sun-Spots-Digest: Volume 9, Issue 401, message 2
X-Note: Submissions: sun-spots@rice.edu, Admin: sun-spots-request@rice.edu

Machine:

Sun 386i/250 w. ExpBox, SunOS 4.0.2

Nature of problem:

Interference of an add-on AT-bus-card (MIRO) with the floppy-disk.  This
problem has not been seen with SunOS 4.0.1

Symptoms:

Reading and writing to the floppydisk (from dos) is very much disturbed,
when the MIRO-card is installed. Sometimes one gets through after a couple
of retries. It seems as the MIRO-SW is using the same signal as is used by
the floppydrive.

Hardware involved:

	miro datensysteme GmbH, D-3300 Braunschweig
	16bit IBM AT compatible Graphicboard 1280x1024, 256 colors
	I/O Space 3E0h or 390h (0-F)
	Memoryspace to map the board in: CC00h - CFFFh ( or 3 alternatives )
	Interrupt: 7Fh

Questions:

What are the differences from SunOS 4.0.1 to SunOS 4.0.2 that might be
responsible for this interference?  How can we overcome this problem
without going back to Release 4.0.1?