Xref: utzoo comp.periphs:1075 comp.sys.att:3825 unix-pc.general:1134 Path: utzoo!utgpu!water!watmath!uunet!hodge!rusty From: rusty@hodge.UUCP (Rusty Hodge) Newsgroups: comp.periphs,comp.sys.att,unix-pc.general Subject: Re: Questions on SCSI device interfacing... Keywords: SCSI, tape, hard drives, cabling, controllers, cost Message-ID: <704@hodge.UUCP> Date: 22 Jul 88 01:06:34 GMT References: <433@icus.UUCP> Organization: Hodge Computer Research Corp., Orange, CA Lines: 44 In article <433@icus.UUCP>, lenny@icus.UUCP (Lenny Tropiano) writes: > With the recent announcement by IDT Systems to support SCSI devices on > the AT&T 3B1, some questions have come up in my mind. > The questions that I have are: > > 1. Do I have to buy a special interface when I purchase SCSI devices, > or if the device says it is SCSI compatible will it include > the necessary hardware to just hook up the 50-pin Centronics SCSI > cable directly? A raw SCSI drive usually has a 50-pin header connection. The standard SCSI connection is a 50-pin Centronics. The Macintosh folks use a DB-25. Don't ask me to explain, but it works. I think that IDT is going to use a DB-25 a la Macintosh. You could just buy any Mac hard drive system and plug it in. Or make a cable and use a raw drive. > 2. How do you hook a multiple of devices (up to 7) to the SCSI host > adapter? Do you just need to daisy-chain them along and give > each a particular identification in the device driver? You just daisy-chain them. The drive has a Device ID jumper on it. There are 8 ids, the host interface is one of them. > 3. Do SCSI devices cost MORE or LESS than other devices? In > particular, tape drives and hard drives. Embedded-SCSI drives cost about 10% more than ther drives sometimes. Some drives (Seagate ST-277N, 60mb 40ms) are very competitive: $450 or less. A SCSI CDC Wren 300mb 16.5ms drive should be able to be found for just over $2000. A 150mb version for under $1300. You can buy a complete CMS Mac External 140mb system for under $1500. This includes a case, power supply and 1-year warranty. There are plenty of other suppliers to choose from (Like Micah, right Larry? :->). Well, this is exciting. I've finally answered a question from Lenny. It feels good to answer rather than ask for a change! :-> -- Rusty Hodge, HCR Inc, 1588 N. Batavia St. Orange, CA 92667 (714) 974-6300 rusty@hodge.cts.com [uunet vdelta crash]!hodge!rusty FAX (714) 921-8038