Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 13 Apr 2002 15:49:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 13 Apr 2002 15:49:52 -0400 Received: from vindaloo.ras.ucalgary.ca ([136.159.55.21]:27531 "EHLO vindaloo.ras.ucalgary.ca") by vger.kernel.org with ESMTP id ; Sat, 13 Apr 2002 15:49:52 -0400 Date: Sat, 13 Apr 2002 13:49:43 -0600 Message-Id: <200204131949.g3DJnhD07302@vindaloo.ras.ucalgary.ca> From: Richard Gooch To: "H. Peter Anvin" Cc: Alan Cox , linux-kernel@vger.kernel.org Subject: Re: linux as a minicomputer ? In-Reply-To: <3CB889C7.2080907@zytor.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org H. Peter Anvin writes: > Richard Gooch wrote: > > > > Actually, there is some impedance matching. I've seen monitors with > > hi/lo impedance switches. And I've used 15 m long high-quality VGA > > cables. The result has been pretty good. > > > > The best I've seen is to use Sun D-sub coax or plain coax inputs on > the monitors that have them. Those are impedance matched and can be > extended without problem. Sure, coax inputs are the best. But there are still problems. Even expensive coax has higher attenuation at higher frequencies, so the longer the cable, the more fuzziness you get. Also, there are differential delay effects between the R, G and B components. You don't want the pixel components to arrive at different times. So there's a length limitation there as well. But even though coax is better, VGA isn't that bad. 15 m gets you quite a lot of terminals in a web kiosk (or undergrad computer lab). BTW: I agree that X terminals suck. Even worse are SunRays. Ug! Regards, Richard.... Permanent: rgooch@atnf.csiro.au Current: rgooch@ras.ucalgary.ca - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/