On Feb 8, 2012, at 1:14 PM, Glen Slick wrote:
On Feb 8, 2012 8:49 AM, "Kevin
Reynolds" <tpresence at hotmail.com> wrote:
Can I put in a SCSI controller on the QBUS of a microvax II or III? I
really want
to keep the QBUS as it is entirely different than everything
else I have. Do you know if there is SCSI support inVMS 5.2?
Kevin
You are not really concerned about native SCSI support but rather MSCP
(disk) and TMSCP (tape). If the OS supports an RQDX controller it should
support an MSCP SCSI controller such as the usual CMD CQD Q-bus SCSI
controllers.
To my knowledge, VMS doesn't really even see past the MSCP at all; there's
not much way it could distinguish between a SCSI disk on a CQD-220 and an
MFM disk on an RDQX3.
Perhaps some confusion arises due to VMS having native support for SCSI
controllers in later machines such as the Microvax 3100?
Lack of this native support in early versions of VMS would cause difficulties
using the SCSI controllers in a 3100 but would not be an issue for a QBUS SCSI
controller which emulates an MSCP controller.
Regards,
Peter Coghlan.