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- Path: sparky!uunet!cs.utexas.edu!rutgers!ub!oswego!soswva!mulvey
- From: mulvey@blurt.oswego.edu (Allen Mulvey, SUNY, Oswego, NY)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: Re: Making a switch for tape backup unit!
- Message-ID: <1993Jan1.233933.966@blurt.oswego.edu>
- Date: 2 Jan 93 04:39:33 GMT
- References: <1993Jan1.213006.12706@magnus.acs.ohio-state.edu>
- Organization: SUNY College at Oswego, Oswego, NY
- Lines: 25
-
- In article <1993Jan1.213006.12706@magnus.acs.ohio-state.edu>, rjones@magnus.acs.ohio-state.edu (Ronald Jones) writes:
- > OK, I've discovered that my tape backup unit won't let me connect it in
- > parrallel with two floppy disk drives. I am now considering using an
- > external mechanical switch to manually select between one of the
- > floppy drives and the tape unit.
- >
- > I suppose I could leave the tape power connection on all the time and
- > use a double throw, multi-pole switch on the control lines to select
- > between the floppy and the tape unit. My question is what is the
- > minimum number of lines (and which ones) would I need to switch. Not
- > all 34 I hope! Has anyone tried this?
- >
- > --
- > < Ron Jones | E-mail: rj+@osu.edu >
- > < The Ohio State University | Office: (614) 292-1665 >
- > < 338 West Tenth Avenue | FAX:(9-5PM) (614) 292-7151 >
- > < Columbus, Ohio 43210 | "eschew obfuscation" >
-
- I would try switching the power first. If the devices use tri state
- buffering they should just show a very high impedance when powered down.
- Unplug the tape power connector and see if the disk drives work then unplug
- the B: drive and see if the tape works.
-
- Allen Mulvey
- mulvey@blurt.oswego.edu
-