Subject: Re: general sun3 question about scsi
From: Curt Sampson <>
List: port-sun3
Date: 04/30/1996 13:52:16
In my experience, if the SBD write/read test fails, there's a
problem with the SCSI controller. As I recall, all tests but the
external loopback test should work with nothing plugged into the
SCSI port. (The external loopback test needs a loopback connector
plugged into the SCSI port.)


Curt Sampson		Info at
Internet Portal Services, Inc.	
Vancouver, BC   (604) 257-9400		De gustibus, aut bene aut nihil.

On Mon, 29 Apr 1996, LANCE TOST wrote:

> Date: Mon, 29 Apr 1996 23:05:35 -0400 (EDT)
> From: LANCE TOST <>
> To: port-sun3@NetBSD.ORG
> Subject: general sun3 question about scsi
> Hi there.. ihave a Sun 3/60 that i recently acquired and am attempting to 
> install netbsd on.  Unfortunately, i can't seem to get my scsi hard drive 
> to work properly.  Here's what i had to do:  Bought an internal scsi 
> drive and an external case.  So as it is, it looks like this:
> Sun DB50 -> Centronics -> into case -> drive -> out of case -> centronics
> My question is, where do i terminate?  On the drive with the terminating 
> resistors i received with it, or on the last centronics port?  
> Regardless, i've tried almost all combinations and it still won't work.  
> The built-in diags report that the SBC wr/rd test fails (no reason) and 
> the external loopback fails (various reasons depending on termination 
> and/or cable directions ... generally it says "all signals should be off 
> (high)".
> Do either of these symptoms suggest the onboard scsi is fried?  People 
> have also  mentioned to me that scsi needs to be terminated at both 
> ends--is this already done on the mainboard?  I can't find a jumper or 
> anything which hints at it.
> Also, when netbooting the netbsd kernel, it finds si0 and reports "SCSI 
> busy, resetting..." or something of the sort.. and it does this forever. 
> Other weird things having to do with spinup occur when i terminate, flip 
> the cable around, etc.. if you think you can help, i can give you more 
> details when you email.
> thanks plenty,