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- Newsgroups: comp.os.os2.programmer
- Path: sparky!uunet!decwrl!csus.edu!netcomsv!mork!jeffc
- From: jeffc@netcom.com (Jeff Cohen)
- Subject: Re: Hard Disk Interrupts?
- Message-ID: <57kmj-f.jeffc@netcom.com>
- Date: Sun, 26 Jul 92 21:32:48 GMT
- Organization: Hacker's Anonymous
- References: <1992Jul26.150420.3389@rock.concert.net>
- Lines: 31
-
- In article <1992Jul26.150420.3389@rock.concert.net> rls@.wedge.nt.com (Robert L. Smith) writes:
- >
- > I've been using OS2/2.0 for a month or so, on a '386DX with two
- >hard drives, and get the impression that OS2 does nothing else --
- >i.e., suspends multitasking -- while a hard disk operation is in
- >progress. If true, the reason may be that OS2 must poll the hard
- >drive adapter to detect completion. One piece of evidence for this
- >conclusion (among others) is that a simple disk-to-disk copy operation
- >in one partition disrupts a 9600-baud com transfer controlled by
- >another.
- > The hard disk adapter on my machine is SCSI. It contains posts
- >for a jumper, presently missing, to enable interrupts for operation
- >complete. Can anyone say whether or not OS2/2.0 is capable of using
- >the hard disk interrupt? Is there a mode whereby the OS allows non-
- >disk activities to proceed while disk-I/O is outstanding and depends
- >upon the interrupt to recover the disk-bound thread? If so the
- >benefits are obvious and I'd like to take advantage of them.
- >
- >Regards, rLs
-
- OS/2 most certainly uses hard disk interrupts, but only if it has
- a native device driver. If your SCSI board doesn't have a native
- OS/2 driver, OS/2 must use the generic INT 13 BIOS interface which
- does not use interrupts. OS/2 ships with native drivers for Adaptec
- and Future Domain SCSI (and IBM, of course).
- --
-
- ==============================================================================
- Jeff Cohen | Standard disclaimer: My views are my own and may or may
- jeffc@netcom.com | not represent the views of IBM.
- ==============================================================================
-