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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!gatech!usenet.ins.cwru.edu!agate!boulder!kinglear!drew
- From: drew@kinglear.cs.colorado.edu (Drew Eckhardt)
- Subject: Re: Adaptec SCSI controllers query
- Message-ID: <1993Jan11.105434.26143@colorado.edu>
- Sender: news@colorado.edu (The Daily Planet)
- Nntp-Posting-Host: kinglear.cs.colorado.edu
- Organization: University of Colorado at Boulder
- References: <1993Jan8.023517.7870@netcom.com> <C0Jv8C.3t7@srgenprp.sr.hp.com>
- Date: Mon, 11 Jan 1993 10:54:34 GMT
- Lines: 28
-
- In article <C0Jv8C.3t7@srgenprp.sr.hp.com> darrylo@sr.hp.com writes:
- >Barry Sardis (bsardis@netcom.com) wrote:
- >
- >> timhu@ico.isc.com (Timothy Hu) writes:
- >>
- >> >Indeed, the only difference between the 1542A and the 1542B is the card
- >> >length. Software-wise, the cards are identical. I verified this with the
- >> >Adaptec people twice.
- >>
- >> That would seem kind of dumb, unless the A has been replaced by the B. I
- >> was under the impression the the B stood for Bus Master.
- >
- > No, both the 1542A and 1542B are DMA bus-mastering cards. I
- >imagine that Adaptec came out with a "B" card because it was cheaper to
- >produce (hence, more profits). I've heard that a 1542C is in the works,
- >but I haven't heard much about it.
- >
- > The cards (1542A vs 1542B) are not 100% identical, though. They're
- >the same as far as MSDOS is concerned, but they're not 100% hardware
- >compatible. For example, an old version of BSD368 (a PC Unix) would not
- >boot from a 1542A, due to some minor difference.
-
- The old 1542's couldn't do scatter-gather, hardly a minor difference when
- you're writing/reading to noncontiguous buffers in memory.
- --
- Boycott AT&T for their absurd anti-BSDI lawsuit. | Drew Eckhardt
- Condemn Colorado for Amendment Two. | drew@cs.colorado.edu
- Use Linux, the fast, flexible, and free 386 unix |
-