Date: Sat, 13 Sep 1997 10:37:54 -0600 From: Warner Losh <imp@harmony.village.org> To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) Cc: hackers@freebsd.org Subject: Re: Do *you* have problems with floppies? Message-ID: <199709131637.KAA05343@harmony.village.org> In-Reply-To: Your message of "Sat, 13 Sep 1997 08:09:39 %2B0200." <19970913080939.WU46166@uriah.heep.sax.de> References: <19970913080939.WU46166@uriah.heep.sax.de> <199709122056.NAA24445@usr08.primenet.com> <Pine.SV4.3.95.970912220547.4487A-100000@kestrel.ukc.ac.uk>
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In message <19970913080939.WU46166@uriah.heep.sax.de> J Wunsch writes: : There are a lot of busy loops in the FreeBSD fdc driver, and you can : send a lovely ``thanks!'' letter to some stupid IBM engineer for : dropping the READY line from the floppy bus, apparently for the sake : of being able to use this twist-some-wires-for-drive-A hack. Actually, the ready line was either 33 or 34, which is at the end of the cable for the SCSI. And it was to allow the drive to signal that the physical disk had changed. Older floppies had this pin being READY, while newer (1.2M and 1.44M and many 720k) ones had it meaning disk change. This is one of the things that Digital got right in the Rainbow. It requires a functional READY line in order to operate properly. Warner
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