Date: Fri, 23 Aug 1996 00:37:06 +0200 From: Torbjorn Granlund <tege@matematik.su.se> To: scsi@freebsd.org Subject: Adaptec 2940UW sync at low rates Message-ID: <199608222237.AAA15687@insanus.matematik.su.se>
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When the 2940UW is set in "Ultra mode", it refuses to talk at lower than 10 MB/s to any devices. Unfortunately, I have a Toshiba 6.7x CD-ROM drive, and a HP DAT drive that max out at 4.4 MB/s and 5.0 MB/s respectively. FreeBSD warns about these devices, but to my surprise, at least the CD-ROM seems to work great! (I haven't tried the DAT drive yet.) My first stupid question is: Can I ignore this problem, or will it cause serious problems with the devices that I simply haven't run into yet? My second stupid question is: Can an ASUS SC200 coexist with an 2940UW? Which one's boot ROM will win...? :-) (The boot ROM for the SC200 is on the ASUS motherboard.) My third stupid question is: If one uses several similar SCSI controllers (say an 2940UW and a plain 2940), which one will be ahc0 and which one will be ahc1? My last stupid question is: Are there (FreeBSD-supported) Ultra SCSI controllers that support more speeds than the 2940UW? I'll run out of PCI slots if I am forced into using two SCSI controllers. Torbjorn
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