benson@vuse.vanderbilt.edu (Paul Benson) (06/27/91)
In article <4778.apple.a2.net@pro-nbs> asong@pro-nbs.cts.com (Andi Song) writes: >In-Reply-To: message from benson@vuse.vanderbilt.edu > > Re: Two mice... > > I think you can. In stores I have seen a Mac with an ADB keyboard, >then a Kensington TurboMouse, then the Apple Mouse, and they all work fine. >---- Umm, I think you misunderstood me. I know you can do this because that is _my_ setup, i.e. keybd, Turbomouse, apple mouse. And this is on a GS. No real problems, for about 4 years. Kind of confusing when the mouse lock is on & I don't realize it. Anyway, I'll repeat for anyone who did not catch it the first time. You may have upto 11 devices on the ADB port. BUT to fully utilize it 1 must be a keybd, one must be a mouse, & one must be a graphic tablet. The remaining 8 may be any combo of the above. In my last post I was unsure about the ADB y-connector, but since the devices are not screening each other for collisions and it is basically just straight wire connections then it should work fine. -- Paul 'BaJa' Benson Vanderbilt University GEnie: P.Benson1 Net: benson@vuse.vanderbilt.edu
David.Empson@actrix.gen.nz (David Empson) (06/28/91)
In article <1991Jun27.015258.29179@vuse.vanderbilt.edu> benson@vuse.vanderbilt.edu (Paul Benson) writes: > ... In my last post I was unsure > about the ADB y-connector, but since the devices are not screening each > other for collisions and it is basically just straight wire connections > then it should work fine. ADB is an open-collector bus. You can probably have any cable configuration you like, provided there are no loops in it and the maximum length isn't exceeded. There is no problem with Y junctions. The main limits (from the IIgs Hardware Reference): Maximum cable length 5 metres, maximum power drain 500 mA (5V). Cable capacitance should not exceed 100 pF per metre. By the way: ADB devices are connected in PARALLEL. The apparent serial connections are an illusion. -- David.Empson@bbs.actrix.gen.nz