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- Newsgroups: comp.os.os2.misc
- Path: sparky!uunet!grebyn!daily!richk
- From: richk@grebyn.com (Richard Krehbiel)
- Subject: Re: XGA-2 Clarification
- In-Reply-To: dic5340@hertz.njit.edu's message of 22 Dec 92 17:31:53 GMT
- Message-ID: <1992Dec23.025902.3505@grebyn.com>
- Lines: 26
- Sender: richk@grebyn.com (Richard Krehbiel)
- Organization: Grebyn Timesharing
- References: <1992Dec18.063416.3786@ultb.isc.rit.edu>
- <pathak-181292115317@virtual.mitre.org>
- <1992Dec19.160935.1073@gandalf.UMCS.Maine.EDU>
- <1992Dec22.173153.29951@njitgw.njit.edu>
- Date: Wed, 23 Dec 1992 02:59:02 GMT
-
- In article <1992Dec22.173153.29951@njitgw.njit.edu> dic5340@hertz.njit.edu
- (David Charlap) writes:
-
- > In article <1992Dec19.160935.1073@gandalf.UMCS.Maine.EDU>
- > jurlwin@gandalf.UMCS.Maine.EDU (Jeff Urlwin) writes:
- > >Bus mastering *is* possible on the ISA bus. The Adaptec 154X SCSI
- > >controllers have been doing it for years (there are PLENTY other
- > >cards that do it too, but I can't even begin to list them all).
- > >And the 1542B just cost me $251, mail order.
- >
- > And Adaptec's non-bus mastering card (1422B, I think) costs about $100
- > less. That's probably the cost of licensing the bus-mastering
- > chipset. Radius also has to pay this.
-
- Adaptec doesn't license anyone's bus mastering chip set. They've been
- bus mastering for years, certainly before there was XGA. In the 1540A
- card they did it with discrete logic and an 8085 CPU (actually, the
- 8085 is probably there to do the SCSI bus protocol). These days, the
- 1540B is more integrated (but still has a CPU).
-
- The 1540 costs $100 more than the 1520 because of the market, not
- because of any particular technicality. People are willing to pay
- that much for it's performance. It's universally supported. The
- BusTek (that's not the company's name anymore but I can't remember the
- new name) 542 clone costs about the same, so there's no motivation to
- drop the price to compete.
- --
- Richard Krehbiel richk@grebyn.com
- OS/2 2.0 will do for me until AmigaDOS for the 386 comes along...
-