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- From: mccall@mksol.dseg.ti.com (fred j mccall 575-3539)
- Subject: Re: Does VESA Local Bus put a huge strain on a CPU?
- Message-ID: <1992Nov5.172246.1853@mksol.dseg.ti.com>
- Organization: Texas Instruments Inc
- References: <Bx29yH.EE8@news.cso.uiuc.edu> <1992Nov2.031700.14433@njitgw.njit.edu> <1992Nov2.224052.7151@mksol.dseg.ti.com> <1992Nov3.195634.7436@njitgw.njit.edu> <1992Nov4.213113.7644@mksol.dseg.ti.com> <Bx7sqF.5zy@news.cso.uiuc.edu>
- Date: Thu, 5 Nov 1992 17:22:46 GMT
- Lines: 34
-
- In <Bx7sqF.5zy@news.cso.uiuc.edu> nap42487@uxa.cso.uiuc.edu (Nishith A. Patel) writes:
-
- >mccall@mksol.dseg.ti.com (fred j mccall 575-3539) writes:
- >[lots of stuff deleted]
-
- >>The only thing local-bus buys you is the ability to shove large images
- >>back and forth to a dumb frame buffer quickly. It's a cheap way to
- >>get fast video performance (which is the thing that most people judge
- >>the speed of a system by).
-
- >That is the idea, get some fast video performance. having the ability to
- >move window information quickly, move graphics screens, quickly, and generally
- >move anything quickly to speed up video performance. I think everyone realizes
- >local bus is not the ideal and only solution for other things. But other than
- >video performance, does anyone really need to get moderate gains in say,
- >hard drives when it means paying that much extra for EISA. True, EISA does
- >well for hard drives because 33 MB/s is more than enough. but for other things
- >like video should also be taken into consideration, and when you do that, I think EISA is not worth it.
-
- Well, if you're only concerned about speeding up video, then you're
- right. EISA isn't the way to go. In fact, under DOS EISA is a waste
- of money. It's practically impossible to saturate the ISA bus under
- DOS anyway. Of course, you could always buy an EISA video board (VERY
- expensive) or get a coprocessed board (so you send it 100k of
- instructions and it produces a 1M image -- also more expensive than a
- dumb frame buffer). All local bus does is save you a little money on
- the add-in cards. What do you do when someone comes up with a better
- coprocessed board and you're suddenly slower again?
-
- --
- "Insisting on perfect safety is for people who don't have the balls to live
- in the real world." -- Mary Shafer, NASA Ames Dryden
- ------------------------------------------------------------------------------
- Fred.McCall@dseg.ti.com - I don't speak for others and they don't speak for me.
-