Date: Thu, 1 Jan 1998 02:25:53 -0800 (PST) From: Rudy Gireyev <rgireyev@yahoo.com> To: freebsd-hardware@FreeBSD.ORG Subject: Re: zip drive problems Message-ID: <19980101102553.12506.rocketmail@send1b.yahoomail.com>
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---Mike Smith <mike@smith.net.au> wrote: > > > My bad ... I wasn't saying that they are all the same, I was refering > > specifically to the parallel unit. But the emulation type thing was just > > what I heard from a friend, so I don't know if it's true or not. I > > originally told him something like what you just told me and he gave me > > the emulation story. > > Tell him to take some of them apart and look at the boards. Yeah, breaking stuff is cool !!! :-) > > > BTW, I don't suppose that anyone has any detailed white papers on the > > subject? > > What subject? Well my knoweledge is somewhat limited on this but I thought I'd share what I know. I apologize in advance if this is common knoweledge and I'm wasting bandwidth. >From what I know the way SCSI world works is you usually have a SCSI interface, which is also a SCSI bus (kinda like PCI), that controls multiple SCSI devices into this bus one can plug in HDs, CD-ROMS, scanners etc etc. Popular examples of SCSI buses are Adaptec AHA family and Symbios 8XX family What makes SCSI devices different from IDE is that they ship with an adapter/controller built into the device itself and that is what makes the SCSI unit intelligent (The hard disk itself may actually be the same as IDE). So SCSI Jaz drive only has a SCSI adapter. The SCSI Parallel has the adapter, the entire SCSI interface (or bus) to control a single unit. And on top of that a custom converter that allows a parallel port to talk to a SCSI interface (Wow that is a lot of hardware) So I guess the new plus drive with parallel and SCSI interface is extremely similar to the old parallel one with simply an external connector added directly into the adapter, bypassing SCSI interface and parallel port. > > -- > \\ Sometimes you're ahead, \\ Mike Smith > \\ sometimes you're behind. \\ mike@smith.net.au > \\ Remember, the race is long, \\ msmith@freebsd.org > \\ and in the end it's only with yourself. \\ > > > _________________________________________________________ DO YOU YAHOO!? Get your free @yahoo.com address at http://mail.yahoo.com
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