Booting XXDP+ from a secondary controller

[Bob Armstrong]

> Glen Slick (glen.slick at gmail.com) wrote:

>On simh it appears that attaching the disk to rqb0
>resulted in a unit 0 drive on the secondary MSCP controller and I
>couldn't find any options to configure the unit number.

  Does XXDP require all MSCP unit numbers be unique?  I thought that was
just RSTS...

  You can do this in simh by attaching the xxdp25.rd52 image to the device
rqb2, since the primary rq controller just uses drives 0/1.  When I did
this, I got the same result (i.e. a halt) as before.

>Have you tried this on the real hardware yet?  On the real hardware
>what unit is the drive you are trying to boot on the SQ703?

  Yes, on the real hardware it doesn't halt; it just seems to hang forever.
The dialog goes something like this (I'm retyping this from my VT320, so
excuse any typos) -

	Commands are Help, Boot, List, Map, Test and Wrap.
	Type a command then press the RETURN key: B/A DU2

	Address = 17760334

	DU2

	... hangs here ....

  BTW, I was wrong before; my SCSI controller is actually a SQ739 rather
than a 703, but I doubt that changes anything.

  There are two SCSI devices on the SQ739, an Exabyte 8505 tape drive and a
RRD43 (a Toshiba something or other) CDROM.  The SQ739 is configured for
17760334 for MSCP and the RRD43 is configured as MSCP unit 2 (i.e. DU2).

  Maybe there's something wrong with the way I'm making the CD image?   Did
you do anything special when you made yours?

Thanks,
Bob