Messages in this thread |  | | | Date | Thu, 13 Aug 1998 17:02:19 -0700 (PDT) | | From | "Jon M. Taylor" <> | | Subject | Re: CHALLENGE!!! =) |
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On Thu, 13 Aug 1998, David Schleef wrote:
> > > > On Wed, 12 Aug 1998, root wrote: > > > > > Hi everybody!!! > > > > > > This is a challenge for me ... and those who don't know how to > > > do it. =) How can I plug in a second SCREEN on a second VIDEO CARD in linux? > > > > > > I mean : I have a 15" SVGA Screen which I use in X-windows, and I would like > > > to plugin a 14" VGA Screen on a second video card.... > > > > > > Do you know that? > > > > > > if yes, reply here and at KURDT@VIDEOTRON.CA > > > > Sure! It's easy! > > > > 1) Turn off computer > > 2) Open up your computer > > 3) Find a free bus slot for your second video card. > > 4) Plug the card into that slot. > > 5) Put the case back on the computer. > > 6) Plug the second monitor into the second video card on the back > > of the computer. > > 7) Plug the power cord for the monitor into the wall outlet. > > > > > > Piece of cake. > > > > And this could potentially blow up both video cards, since they don't > typically have protection against two cards driving the bus at the > same time. (The Diamond Speedstar in my hand appears to use 74LS245's > to tristate the data lines, but if you connect the output of one to > the output of another when neither are tri-stated -- blammo!)
Plug 'n Play compliant hardware is supposed to be immune to this. Lots of ostensibly PnP cards don't meet the spec in various ways, however |-<. I haven't heard of this causing a problem, but that doesn't mean it can't (or hasn't) happen(ed).
> There are various web pages and FAQs discussing this. I have no references, > since it is just as easy for interested people to search for these as it is > for me. > > The cases where you could potentially use two video cards (hardware limitation): > > 1 Both are on the PCI bus
And can be MMIO relocated correctly - bugs abound. Conflict matricies of card-card multihead interactions will need to be written up, and probably codified in KGI as well. Yes, there are that many special cases to consider.
> 2 One is on PCI and one is VGA on ISA (maybe) > 3 VGA and MDA > 4 You have a modified VGA card that translates bus addresses
5 One VLB and one ISA/PCI.
> Assuming you have such a combination ready, you must look for software that > can handle it. There is a commercial X server that handles multi-heading for > the PCI/PCI case. I've heard reports of people using MDA as a console and > VGA for X. Last I checked, there did not appear to be kernel support for > multiple consoles. (sounds like a fun project...)
KGI can multihead VGA/MDA, VGA/PCI and PCI/PCI. Only a few cases have been tested, but it does work.
Jon
--- 'Cloning and the reprogramming of DNA is the first serious step in becoming one with God.' - Scientist G. Richard Seed
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