Microvax 3100-95 SCSI oddity

From: Fred N. van Kempen <waltje_at_pdp11.nl>
Date: Sat May 8 13:33:41 2004

On Sat, 8 May 2004, Witchy wrote:

> Spent a day troubleshooting this one so I'm wondering if any of you have
> come across this before: 3100-95 with internal SCSI set at ID 7. Give it a
> boot disk at any free ID and another device (doesn't matter what) at ID 6.
> At the dead sergeant prompt all the devices are visible, but boot VMS 7.2
> and whatever device you have at ID 6 is not seen unless it's the boot disk
> itself in which case it shows up as DKA600.
>
> Is there something hard-coded into VMS for MicroVAX 3100s that always
> assumes the SCSI controller is at ID 6 no matter what? I know that older
> 3100s always had the controller at 6 and I don't remember it being
> changeable....
Yes. Although you can set it at the >>>, you can safely assume
that most software will reset it to 6 at driver init. Dont ask
me why, I got bitten by it too, when trying to linking to 3100's
together over SCSI.

--f
Received on Sat May 08 2004 - 13:33:41 BST