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- Newsgroups: comp.sys.apple2
- Path: sparky!uunet!comp.vuw.ac.nz!actrix!David.Empson
- From: David.Empson@bbs.actrix.gen.nz
- Subject: Re: How does Eject work on an Apple 3.5 drive?
- Organization: Actrix Information Exchange
- Date: Sun, 3 Jan 1993 00:16:20 GMT
- Message-ID: <1993Jan3.001620.7399@actrix.gen.nz>
- References: <1993Jan2.061850.8141@cs.uow.edu.au>
- Sender: David.Empson@actrix.gen.nz (David Empson)
- Lines: 23
-
- In article <1993Jan2.061850.8141@cs.uow.edu.au> david@cs.uow.edu.au (David E A Wilson) writes:
- > I have looked at the IWM pinout description in tn-misc-006 and read
- > descriptions of the 5.25" disk drive, Unidisk 3.5 Smartport and everything
- > else I could find but have never been able to find out what the controller
- > does to cause an Apple 3.5 to eject. The only additional signal the 3.5
- > has over the 5.25 is the head select. How then can the drive be told to
- > eject the disk?
-
- The eject is performed by starting the drive motor and setting up a
- normally illegal combination on the phase lines. I can't remember
- where I read this, and I can't find the test program I used to confirm it.
-
- > Additionally, what precisely is the difference between the Macintosh 3.5
- > interface and the Apple 3.5 interface (apart from the pulse width modulation
- > signal required by the old 400k drives)?
-
- It may just be that the drive has to recognise and ignore accesses to
- SmartPort and 5.25" drives in order to work on an Apple II.
- --
- David Empson
-
- Internet: David.Empson@bbs.actrix.gen.nz EMPSON_D@kosmos.wcc.govt.nz
- Snail mail: P.O. Box 27-103, Wellington, New Zealand
-