From owner-freebsd-hackers Sat Oct 7 13:47:33 1995 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.6.12/8.6.6) id NAA21995 for hackers-outgoing; Sat, 7 Oct 1995 13:47:33 -0700 Received: from etinc.com (etinc-gw.new-york.net [165.254.13.209]) by freefall.freebsd.org (8.6.12/8.6.6) with ESMTP id NAA21982 for ; Sat, 7 Oct 1995 13:47:29 -0700 Received: from websurfer.etinc.com (websurfer.etinc.com [204.141.95.5]) by etinc.com (8.6.11/8.6.9) with SMTP id QAA24822; Sat, 7 Oct 1995 16:54:41 -0400 Date: Sat, 7 Oct 1995 16:54:41 -0400 Message-Id: <199510072054.QAA24822@etinc.com> X-Sender: dennis@etinc.com X-Mailer: Windows Eudora Version 2.0.3 Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" To: Mark Hittinger From: dennis@etinc.com (dennis) Subject: re: VLB Disk Controllers Cc: hackers@freebsd.org Sender: owner-hackers@freebsd.org Precedence: bulk >> >> 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. > One big issue with VLB is that you have to know how to tune the bus. Most MBs have tuning parameters to overcome these problems. Dennis ---------------------------------------------------------------------------- Emerging Technologies, Inc. http://www.etinc.com Synchronous Communications Cards and Routers For Discriminating Tastes. 56k to T1 and beyond. Frame Relay, PPP, HDLC, and X.25