Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!uunet!tellab5!wiseman From: wiseman@tellabs.com (Jeff Wiseman) Newsgroups: comp.sys.mac.hardware Subject: Re: Help w/SCSI ID# on Apple 20 Meg Drive? Message-ID: <4226@tellab5.tellabs.com> Date: 16 Oct 90 17:40:24 GMT References: <3349@idunno.Princeton.EDU> <1990Oct15.234256.26540@eng.umd.edu> Sender: news@Tellabs.COM Organization: Tellabs, Inc. Lisle IL Lines: 60 In article <1990Oct15.234256.26540@eng.umd.edu> russotto@eng.umd.edu (Matthew T. Russotto) writes: >In article <3349@idunno.Princeton.EDU> zimerman@phoenix.Princeton.EDU (Jacob Ben-david Zimmerman) writes: >>Hi! I have two questions. The first is: I have an Apple (originally >>Miniscribe) 20 meg drive taken out of a stock SE. I am using it in >>conjunction with an internal 40meg in a Mac II. The problem is, I want >>the 40 meg to boot first. How do I set the SCSI ID number on the 20 meg >>drive? The controller says 'adaptec' on it as well as Miniscribe. There should be a set of jumpers on the scsi controller card attached to the drive itself. I beleive that there are 5 pairs of jumpers. 3 pairs are used to set the SCSI address, one is to enable a test mode of some kind, and the other is to enable/disable the "auto park heads after approx. 25 seconds of inactivity" feature. Which is which? I forget (I think the scsi pins are the 3 pair towards the center of the board) but try phoning MINISCRIBE's technical support at 1-800-356-5333. I've had this number a long time but it was still in use last spring when I needed to contact Miniscribe for the same reason you have. Also since the 3 pair are adjacent to each other and at one end of the 5 pair, you may be able to guess by the existing jumpers and knowing what the drive is currently configured to (probably 0). Set your internal drive to SCSI id 0 so that I is looked at last for booting. (if it came already in the machine, it is probably already set to this value). This allows you to plug an external in and have the external be the drive to boot first (like overriding the harddisk by plugging in a floppy first). Set your external to anything other than 0 or 7 (the mac is 7). Now if you want your internal to always boot first regardless of any external's presence, open your control panel and (assuming it's in the system folder) select the "startup device" (or whatever it's called, you know, the one who's icon looks like a disk). This overrides the natural SCSI address startup order. >I don't know how you change the SCSI ID on the miniscribe, but on the internal >40meg Quantum, you should find some jumper blocks with lines labeled 'A0', >'A1', 'A2'. (underneath the drive) Put jumpers across any one or any two of Just an item of interest. The Quantum 40's are one of the drives that can have their scsi id's changed via software. Silverlining allows you to set the scsi id of one of these drives to a value of 0-6 OR "jumpers". This wasn't really well documented in their manual and I stumbled on it one day when I thought that I had screwed up my scsi bus! Since I use Silverlining EXCLUSIVELY on my drives (oh you poor souls still relying on Apple's software :-) :-) I now have the capability of putting another device on my scsi chain and changing the ids to be compatable without needing a screwdriver (not mention all the other neet tricks. Now if I can just get around to sending in for my almost free update I will be able to use their new graphical disk optimizer). Oh, and one last thing. If that Miniscribe was stock in a new mac at one time, it is likely set to id 0 already. I believe that means there are NO jumpers to be moved, only added. These are special low profile type jumpers that you could probably get at an apple service center somewhere. You will need 1 to set id's 1,2, and 4, you will need 2 for 3,5, and 6. Hope this helps! -- Jeff Wiseman: ....uunet!tellab5!wiseman OR wiseman@TELLABS.COM