marsella@athos.rutgers.edu (Stacy Marsella) (07/10/90)
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. My question stems from a desire to use one of these scsi-st506 boards to hook a Maxtor 1140 (918 cyls, 15 heads, 140 meg) to a NeXT (not a Mac - but any Mac/SCSI peculiarities may well be pertinent). I have tried an adaptec 4000(a?) with no success so far - the system never recognizes the adaptec. In effect, it never reports seeing the adaptec on the bus during the boot. The adaptec is set for scsi address 0 which should not interfere with the NeXT. Indeed, the Next side seems fine - it will recognize a scsi tape controller (an emulex if memory serves). Any suggestions? S. Marsella marsella@athos.rutgers.edu
josef@nixpbe.UUCP (Moellers) (07/12/90)
In <Jul.9.19.56.51.1990.6031@athos.rutgers.edu> 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. As far as I remember having read in the 4000A's manual, the Mac seems to have an odd block size, something like 576 bytes, but defeinitely nothing like a power of 2. The 4000A apparently has a special jumper to cater for Macs. -- | Josef Moellers | c/o Nixdorf Computer AG | | USA: mollers.pad@nixbur.uucp | Abt. PXD-S14 | | !USA: mollers.pad@nixpbe.uucp | Heinz-Nixdorf-Ring | | Phone: (+49) 5251 104662 | D-4790 Paderborn |
tarsa@abyss.zk3.dec.com (Greg Tarsa) (07/12/90)
In article <Jul.9.19.56.51.1990.6031@athos.rutgers.edu>, 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