Date: Sat, 07 Oct 1995 14:33:10 -0700 From: "Justin T. Gibbs" <gibbs@freefall.FreeBSD.org> To: Mark Hittinger <bugs@ns1.win.net> Cc: hackers@freebsd.org Subject: Re: VLB Disk Controllers Message-ID: <199510072133.OAA26178@aslan.cdrom.com> In-Reply-To: Your message of "Sat, 07 Oct 1995 16:30:28 EDT." <199510072030.QAA20211@ns1.win.net>
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>> >> Adaptec, Buslogic. Any possitive or negative comments on the drivers would >> be welcome. >> > >I have had problems with vlb cards running above 33 MHZ. The effect appears >like the loss of interrupts or extreme interrupt latency. I have seen this >especially bad on amd 486dx2/80 (vlb clk 40mhz) and 486dx2/100 (vlb clk 50mhz) >. >I suspect the problem would exist on 486dx50 as well. > >The effect seems to be very pronounced on vlb disk controller cards with >other i/o on board. You have to be carefull of your motherboard and videocard in any VLB implementation and even more so if you go about 40MHz. I've seen video cards corrupt bus mastering transfers before and lots of motherboards that don't work with VLB busmasters. I've never experienced a problem on my hardware, and those who have complained to me about the 2842 not working correctly later discovered it was their video card, motherboard or a memory problem. There are also a lot of VLB "super I/O" cards out there that are pure junk. We aren't talking about IDE interfaces anyway. > >Regards, > >Mark Hittinger >Internet Manager >WinNET Communications, Inc. >bugs@win.net -- Justin T. Gibbs =========================================== Software Developer - Walnut Creek CDROM FreeBSD: Turning PCs into workstations ===========================================
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