Re: What's wrong with OPTi chipsets?

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#19486

From: Thomas D. Barrett
Date: Fri, 08 Jan 1993 23:09

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In article <1993Jan8.155205.2238@wam.umd.edu> warren@wam.umd.edu (the stupid one) writes:
>some OPTi chipsets made in the past couple years appear to have
>a DMA fault that shows up on faster boards (33+MHz)

There was one weird "feature" which Forex copied when they cloned the
OPTi chipset... if MASTER# is pulled active outside of DACKi#, then
the system resets.  This occured a lots of times when DREQi was
removed ahead of MASTER# to speed-up the already slow handshaking.

If this is what everyone was referring to, it went away when the 385
chips were no longer being used.

-- 
|Tom Barrett (TDBear), Sr. Engineer|tom.barrett@amd.com|v:512-462-6856 |
|AMD PCD MS-520 | 5900 E. Ben White|Austin, TX  78741  |f:512-462-5155 |
|"No is yes, And we're all free" ---Tracy Chapman, "Why?"              |
|My views are my own and may not be the same as the company of origin  |

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<1993Jan7.174610.18631@murdoch.acc.Virginia.EDU> <dvs.43.726474459@ze8.rz.uni-duesseldorf.de> <1993Jan8.155205.2238@wam.umd.edu>

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Path: arc1-ca.pugleaf.net!sparky!uunet!wupost!crcnis1.unl.edu!moe.ksu.ksu.edu!zaphod.mps.ohio-state.edu!cs.utexas.edu!sun-barr!ames!pacbell.com!charon.amdahl.com!amdahl!amdcad!dvorak.amd.com!tdbear
From: tdbear@dvorak.amd.com (Thomas D. Barrett)
Subject: Re: What's wrong with OPTi chipsets?
Message-ID: <1993Jan8.230902.2656@dvorak.amd.com>
Organization: Advanced Micro Devices, Inc.; Austin, Texas
References: <1993Jan7.174610.18631@murdoch.acc.Virginia.EDU> <dvs.43.726474459@ze8.rz.uni-duesseldorf.de> <1993Jan8.155205.2238@wam.umd.edu>
Distribution: usa
Date: Fri, 8 Jan 93 23:09:02 GMT
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