Article View: gnu.misc.discuss
Article #74734Re: AT&T Threat against X Windows freedom
From: Andy Newman
Date: Tue, 05 Mar 1991 23:02
Date: Tue, 05 Mar 1991 23:02
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1763 bytes
In article <1991Feb27.231511.19935@digibd.com> rhealey@digibd.com (Rob Healey) writes: > The concept of backing store strikes me as being something that > could have easily been prior art, but only AT&T bothered to > patent it? Are there any examples of backing store before 1985? > I think AmigaDOS has had backing store since before 1984... > > -Rob Well when I hacked a simple window system for my MicroBee (Z80 CP/M system with primitive graphics) back in 1983 I implemented backing store ... seemed to be the only reasonable thing to do in a window system (IMHO). I went to great pains to minimise the amount of memory used to save obscured window regions and to allow I/O to those areas. At that stage in my computing life I hadn't heard of Rob Pike's work (let alone software patents). -- Andrew Newman, Software Engineer. | Net: andy@research.canon.oz.au Canon Information Systems Research Australia | Phone: +61 2 805 2914 P.O. Box 313 North Ryde, NSW, Australia 2113 | Fax: +61 2 805 2929
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 1025b4,b0a85d23901c1430 X-Google-Attributes: gid1025b4,public X-Google-ArrivalTime: 1991-03-06 17:16:22 PST Path: arc1-ca.pugleaf.net!gmdzi!unido!mcsun!uunet!munnari.oz.au!metro!research.canon.oz.au!andy From: andy@research.canon.oz.au (Andy Newman) Newsgroups: gnu.misc.discuss Subject: Re: AT&T Threat against X Windows freedom Message-ID: <1991Mar5.230237.669@research.canon.oz.au> Date: 5 Mar 91 23:02:37 GMT References: <1991Feb25.043755.17220@algor2.algorists.com> <1991Feb27.231511.19935@digibd.com> Sender: andy@research.canon.oz.au (Andy Newman) Reply-To: andy@research.canon.oz.au (Andy Newman) Organization: Canon Information Systems Research Australia Lines: 18