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- Xref: sparky comp.sys.apple2:26468 comp.sys.mac.hardware:25376
- Path: sparky!uunet!vnet.ibm.com
- From: Pauley@vnet.ibm.com (Paul Benson)
- Message-ID: <19930106.070757.947@almaden.ibm.com>
- Date: Wed, 6 Jan 93 10:06:04 EST
- Newsgroups: comp.sys.apple2,comp.sys.mac.hardware
- Subject: Re: One keyboard for 2 computers
- Organization: IBM Personal Computer Co. - PS/1 Development
- Disclaimer: This posting represents my views, not necessarily IBM's.
- News-Software: UReply 3.0
- References: <1993Jan5.184359.18595@src.honeywell.com> <1993Jan5.203139.13991@zip.eecs.umich.edu>
- <1993Jan6.074142.14568@actrix.gen.nz>
- Lines: 21
-
- In <1993Jan6.074142.14568@actrix.gen.nz> David.Empson@bbs.actrix.gen.nz writes:
- >Not a good idea. A-B switch boxes are fine for serial connections,
- >but ADB also supplies power to the peripherals. It isn't designed to
- >have devices being connected and disconnected while the power is on
- >(which is effectively what you do when you switch the device over).
-
- I responded in email with about the same answer. The power problem would
- be solved by having the keyboard power pin being directly connected to
- one of the computers, which would therefore never be switched and cause
- power spikes. Granted the computer supplying the power would have to be
- turned on first. Also, when powering up the computers, the keyboard must
- be switched to the computer being turned on so that the ADB toolset will find
- it in its search.
-
- >Apart from power, the computer might not like having a keyboard appear
- >or disappear suddenly (from a protocol point of view).
-
- This is my only concern.
-
- Pauley
- GEnie: P.Benson1
-