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In article <4e5gg2$f6@newsstand.cit.cornell.edu>, William Magro <wmagro@msc.cornell.edu> wrote: >Scott Shuchart (shuchart@fas.harvard.edu) wrote: > >: This situation doesn't make sense to me. 640x480x256 is 1Mb Vram, no matter >: what the colors are. And grays are just some colors. [...] > >The catch here is that the 256 colors of VGA are chosen from a palette >of 256k (or fewer) colors with standard VGA cards. Since each gray >must have equal components of red, green, and blue, this reduces the >effective number of true grays to 64 [=262144^(1/3)]. It takes a >24-bit D/A converter (8-bits in each channel) to generate 256 grays. > >In the end, the number of grays you can generate depends on the bitness >of your DAC and the smarts of the video driver. But most all cards capable of doing more than 256 colors also have 24-bit (as opposed to 18-bit) DACs. My s3-968 based card can do 256 greyscales when in 8-bit pseudocolor mode. So can just about any modern graphics card. -- |Gazing up to the breeze of the heavens \ on a quest, meaning, reason | |came to be, how it begun \ all alone in the family of the sun | |curiosity teasing everyone \ on our home, third stone from the sun. | |Trent Piepho (xyzzy@u.washington.edu) -- Metallica | From owner-paper Fri Jan 26 06:35:57 1996 Return-Path: <owner-paper> Received: by ftp.ardi.com (Smail3.1.29.1 #3) id m0tfoJn-0007qIa; Fri, 26 Jan 96 06:35 MST Sender: owner-paper Received: from tide10.microsoft.com by ftp.ardi.com with smtp (Smail3.1.29.1 #3) id m0tfoJE-0007qHC; Fri, 26 Jan 96 06:35 MST Received: by tide10.microsoft.com; id FAA14453; Fri, 26 Jan 1996 05:52:29 -0800 Received: from unknown(157.54.17.74) by tide10.microsoft.com via smap (g3.0.3) id xma014404; Fri, 26 Jan 96 05:51:59 -0800 Received: from xnet2 (xnet2.microsoft.com [157.54.17.205]) by imail2.microsoft.com (8.7.1/8.7.1) with SMTP id FAA01246; Fri, 26 Jan 1996 05:37:46 -0800 (PST) X-Received: from nax-01-hub by xnet2 with receive; Fri, 26 Jan 1996 05:34:31 -0800 X-Received: from eux-02-hub by nax-01-hub with receive; Fri, 26 Jan 1996 05:34:27 -0800 X-Received: from lul-02-msg by eux-02-hub with receive; Fri, 26 Jan 1996 13:34:13 +0000 X-MSMail-Identification-du-message: 3E4DF794 X-MSMail-ID-de-la-conversation: 3E4DF794 From: Florent Pitoun (Itl Temp) <i-flopit@microsoft.com> To: executor@ardi.com, owner-paper@ardi.com Date: Fri, 26 Jan 96 14:30:38 PST Subject: Re: Can Quix save Apple? X-MsXMTID: lul-02-msg960126133356MTP[01.52.00]000000bf-28326 Message-Id: lul-02-msg960126133356MTP[01.52.00]000000bf-28326 X-MSContent-Transfer-Encoding: Quoted-Printable Sender: owner-paper@ardi.com Precedence: bulk <Sender composed mail containing characters not in the US-ASCII set.> <These characters have been transformed into a printable form.> you speak of installing system 7.5 in faq on future versions of = executor. For which release n=B0 is this planned? About future release 2, will it support extensions system? When do you plan to release version 2 and what capabilities will it have? Florent ---------- De: "Clifford T. Matthews" <ctm@ardi.com> A: <executor@ardi.com> Objet: Re: Can Quix save Apple? Date: vendredi 26 janvier 1996 03:33 >>>>> "Kevin" =3D=3D Kevin Hayes <hayes@ug.cs.dal.ca> writes: In article <1996Jan24.154317.45212@ac.dal.ca> hayes@ug.cs.dal.ca (Kevin = Hayes) writes: >> Personally, I think there are irreversible aspects of such a >> decision, because once the System 7 brought to Intel machines, >> the customer will no more rely on Apple's hardware, but on the >> other side, is not too much risky a move, becaus of the >> possibility to have the Copland running only on true Macs, or >> other similar arrangements. >> Kevin> MacOS is a stupid idea on Wintel machines - it'd be slower Kevin> and there would be mountains of work involved to getting it Kevin> to run on all Wintel systems - you're forgetting in the Kevin> Wintel world there's no such thing as standards. MacOS on PC hardware could run very fast via dynamic recompilation* and could run blazingly fast if compiler tools were available** to allow CPU intensive routines to be compiled into 80x86 code by the software author. There are many standards in the PC world that would be very useful to a port of MacOS to PCs, for instance the VESA 2 extensions. We wrote Executor, a Macintosh emulator that allows PCs to run much 68k Macintosh software, and it does so faster on entry level Pentiums than any 68k based Macintosh Apple ever released. We did this all without any help from Apple and we do not use any of Apple's ROMs or System file, nor have we disassembled any of Apple's ROM or System file. By doing it this way we have not been able to support all of System 7, much less support post System 7 features like QuickTime. In addition, there are still enough compatbility problems that many programs do not work. *However*, if we could license System 7.5, we could fairly easily get a very large degree of compatibility, since we'd be using Apple's code with all its quirks, rather than our rewrite from incomplete and inaccurate documentation. See http://www.ardi.com for more information about Executor. There is also an Executor newsgroup: comp.emulators.mac.executor. We continue on a day to day basis assuming that Apple is not interested in embracing our technology, and that is their decision, but MacOS 7.5 could run very quickly indeed on PCs. What we have done is *much* more difficult than what QUIX has done, and infinitely more useful if Apple ever wants to reward their software developers and potentially take on Microsoft on Intel based PC hardware. Intel is not the enemy. --Cliff ctm@ardi.com __________________ *We've done this already. **We will do this in '96