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- From: ak@ananke.stgt.sub.org (Andreas Kaiser)
- Newsgroups: comp.periphs.scsi
- Subject: DMA Speed For Adaptec 1542B SCSI
- Distribution: world
- Message-ID: <721840210snx@ananke.stgt.sub.org>
- References: <BxL4rr.Grp@sti.com>
- Date: Sun, 15 Nov 92 15:10:10 GMT
- Organization: ananke
- Lines: 21
-
-
- In article <BxL4rr.Grp@sti.com> westes@sti.com writes:
-
- > According to my 1542B manual, you can set the default DMA transfer speed
- > between 5 and 8 MB/s. What's the fastest that you can safely set this
- > to on an ISA machine?
-
- It totally depends on your machine. Some allow 10MHz, some 6.7, some
- only 5MHz.
-
- The BIOS ROM contains a DMA test routine (at xxxx:000C if I remember
- correctly). If this test fails at a given speed, you cannot use this
- speed (you'd better boot from floppy to run the test). If it succeeds,
- you are on your own - on my system, the test succeeds at 6.7MHz but the
- filesystem crashes when the adapter is actually used at 6.7MHz.
-
- Gruss, Andreas Kaiser
-
- :::::::::::::::::::: subnet: ak@ananke.stgt.sub.org
- :: Andreas Kaiser :: fidonet: 2:241/7220.9
- ::::::::::::::::::::
-