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- Newsgroups: comp.sys.mac.hardware
- Path: sparky!uunet!spool.mu.edu!umn.edu!csus.edu!netcom.com!sjk
- From: sjk@netcom.com (Shel Kaphan)
- Subject: Re: SCSI questions
- Message-ID: <1992Dec19.063142.1271@netcom.com>
- Keywords: SCSI, Nubus
- Organization: Netcom - Online Communication Services (408 241-9760 guest)
- References: <1992Dec18.215923.1922@netcom.com> <1992Dec19.034618.23540@eng.umd.edu>
- Date: Sat, 19 Dec 1992 06:31:42 GMT
- Lines: 27
-
- russotto@eng.umd.edu (Matthew T. Russotto) writes:
- >In article <1992Dec18.215923.1922@netcom.com> sjk@netcom.com (Shel Kaphan) writes:
- >>
- >>I have some questions about hooking things up to the Mac SCSI bus.
- >>
- >>- Are there any Nubus boards that give you a second SCSI bus? If so,
- >Yes, but I don't know any more information. There are several SCSI-2
- >card makers and at least one I saw makes a mirroring system.
-
- I just saw one also in the MacWarehouse catalog, but the ad makes no
- mention of software interfaces.
-
- >>- If one wanted to hook up a "raw" disk drive, i.e. one that does NOT
- >>contain a filesystem (but IS formatted!), is it necessary to supply a
- >>driver? Or can one simply get bits on/off it using the SCSI manager?
- >>Or does the SCSI manager somehow depend on the driver being there?
-
- >The driver is just a layer (of sanity, one might say) over the SCSI
- >manager. If you can stomach programming the SCSI manager, you can use
- >the disk drive raw.
-
- So, if there's no driver installed on some random SCSI device, the
- system won't barf during boot? But it will still leave things in a
- state where the SCSI manager can talk to it? (I hope so...)
-
- The other big question is then, how does the SCSI manager get to know
- there's another SCSI bus on the machine? There are no parameters in
-