Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucsd!usc!snorkelwacker!paperboy!husc6!genrad!decvax.dec.com!abyss.zk3.dec.com!tarsa From: tarsa@abyss.zk3.dec.com (Greg Tarsa) Newsgroups: comp.periphs.scsi Subject: Re: Adaptec SCSI-ST506 Message-ID: <133@decvax.decvax.dec.com.UUCP> Date: 12 Jul 90 15:23:49 GMT References: Sender: news@decvax.dec.com.UUCP Reply-To: tarsa@abyss.zk3.dec.com (Greg Tarsa) Lines: 28 In article , marsella@athos.rutgers.edu (Stacy Marsella) writes: |> |> Does anyone know the differences between the various Adaptec SCSI to |> ST506 boards? The Adaptecs come in various models, such as the |> 4000(a), 4010 (advertised as a mac version of the 4000a), and the 4070 |> (a rll version). And I just saw an ad mention an ADAPTEC model 5500 |> scsi to st506. Precisely how do these models differ? For instance, I |> vaguely remember reading that there was something special about Macs |> vis-a-vis the scsi standard, but I have no idea how/why this might |> relate to there being a special adaptec board. |> The 4000 series are all SCSI controllers that do not support "disconnect-reconnect". The 4070 encodes the drive in RLL format, the others are all MFM. RLL, if your drive supports it allows you to get about 150% of its rated capacity. The 5000 series is a more complete SCSI implementation and supports disconnect-reconnect and, I believe, most all of the Common SCSI Command set. I can't help you with your specific problems. Greg Tarsa Software Consulting -------------------------------- 33 Seabee Street Bedford, NH 03102 tarsa@elijah.mv.com (603)668-9226 {decuac,decvax}!elijah!tarsa