dayao@bashful.cs.wisc.edu (Anthony B. Dayao) (11/27/90)
I have an internal hard disk that I converted to an external SCSI drive. The problem is that it works with Mac SE's and Mac II's but not on Mac Plus's. On a Mac Plus, no disk image comes out.....as if no drive is connected. The drive was formatted using a Mac II. All the cables are fine. I have a SCSI terminator that works. Does anyone have a fix for this? I've received the ff. suggestions: a) my EPROM's are dumb and I might need an upgrade. b) Mac Plus'es do not provide internal termination, so I need a resistor pack in addition to a SCSI terminator. My disk is a Seagate, 105MB. Does anyone have Seagate's phone #? Thanks, --anthony dayao@cs.wisc.edu P.S. Please respond directly by e-mail. I seldom read this news group.
alex@grian.cps.altadena.ca.us (Alex Pournelle) (11/27/90)
dayao@bashful.cs.wisc.edu (Anthony B. Dayao) writes: >I have an internal hard disk that I converted to an >external SCSI drive. The problem is that >it works with Mac SE's and Mac II's but not on Mac Plus's. >On a Mac Plus, no disk image comes out.....as if no drive is connected. >Does anyone have a fix for this? >I've received the ff. suggestions: >a) my EPROM's are dumb and I might need an upgrade. >b) Mac Plus'es do not provide internal termination, so I need > a resistor pack in addition to a SCSI terminator. Let me add c) you have a termination-power problem; the Plus and the rest of the Mac line are at odds about who provides power to the SCSI bus. Cure: I know not. d) you have the old UNIT ATTENTION (why did I first write UNIX ATTENTION? Is it genetic, or curable?) problem of older Mac Plus ROMs. This is cured by hacking pin 40 of your SCSI cable, or booting off floppy and then mounting the drive. e) the SCSI gremlins don't like your cabling. How long is it, if that's not too personal a question :-)? >Does anyone have Seagate's phone #? 800 directory assistance does, like almost every company with 800 tech. support. Good luck: they don't provide very general support, often. > Please respond directly by e-mail. I seldom read this news group. Tough noogies: it appears to be my turn in the barrel to answer general net questions, so I'm answering by news. (This is a nefarious plot to get other, more esoteric questions answered when I need to--or is it just good netiquette? Me, good netiquette? Hah!) Hope this helps, Alex -- Alex Pournelle, freelance thinker Also: Workman & Associates, Data recovery for PCs, Macs, others ...elroy!grian!alex; BIX: alex; voice: (818) 791-7979 fax: (818) 794-2297 bbs: 791-1013; 8N1 24/12/3