paryavi@harris.cis.ksu.edu (Saiid Paryavi) (09/12/89)
My Mac Plus simply refuses to boot off of my Newbury 3380 drive. As I
understand it, the Mac Plus does not provide power on the SCSI bus and if
a drive is depending on SCSI bus power for termination, it will not be
recognized?!! The 3380 has a jumper that determines if the drive should
get its termination power from the SCSI bus or from the drive itself. I
tried it in either position but still the Plus refused to boot from it.
Does any of you SCSI gurus out there recognize this problem and can suggest
a solution?
I appreciate your help very much.
--
Saiid Paryavi Computer Science Dept.
Internet: paryavi@harris.cis.ksu.edu Nichols Hall
BITNET: paryavi@ksuvax1.bitnet Kansas State University
UUCP: {rutgers, texbell}!ksuvax1!harry!paryavi Manhattan, KS 66506jlohmeye@entec.Wichita.NCR.COM (John Lohmeyer) (09/12/89)
In article <3436@deimos.cis.ksu.edu> paryavi@harris.cis.ksu.edu (Saiid Paryavi) writes: >My Mac Plus simply refuses to boot off of my Newbury 3380 drive. ... What Saiid tried with no success is deleted ... >Does any of you SCSI gurus out there recognize this problem and can suggest >a solution? I understand that Macs will not boot if the drive reports CHECK CONDITION status to the first I/O (as required by SCSI). Some drive vendors have jumpers or a special mode page to disable the reporting of unit attention so that their drives can be used on Macs. If the Mac will talk to your drive after booting on some other drive, this is probably your problem. -- John Lohmeyer J.Lohmeyer@Wichita.NCR.COM NCR Corp. uunet!ncrlnk!ncrwic!entec!jlohmeye 3718 N. Rock Rd. Voice: 316-636-8703 Wichita, KS 67226 SCSI BBS 316-636-8700 300/1200/2400 24 hours
km@cadre.dsl.pitt.edu (Ken Mitchum) (09/14/89)
>My Mac Plus simply refuses to boot off of my Newbury 3380 drive. As I >understand it, the Mac Plus does not provide power on the SCSI bus and if >a drive is depending on SCSI bus power for termination, it will not be >recognized?!! The problem with Newbury drives and the MacPlus does not have anything to do with the source of +5 volts for the terminating resistors, which should be the drive. The problem with the MacPlus appears to be that the Newbury drive spends an inordinate amount of time doing self-testing on powerup, and ends up sitting on the SCSI bus. This is not appear related to the infamous "unit attention on reset" problem, as it still occurs when unit attention on reset is disabled, and with new Mac roms. The drives work fine with newer Macs, which apparantly recover and reset the bus. My solution was to simply boot the MacPlus from a floppy, then switch to the hard disk. Ken Mitchum Decision Systems Labs Univ of Pgh km@cadre.dsl.pitt.edu