[vcf-midatlantic] vax scsi questions

william degnan billdegnan at gmail.com
Sun Oct 8 14:14:44 EDT 2017

> Some MicroVAXes in the 3100 series came with two SCSI busses.  There
> are designated A and B.  The SCSI id for the MicroVAX controller was
> typically 7; so devices could be attached with ids from 0 to 6.  The
> naming of the devices, when VMS is booted are:
> ddcn:  when dd is the name of the driver controlling the device.  If
> the device is  disk, this is DK (DKDRIVER).  If the device is a tape,
> it's MK (MKDRIVER).  The 'c' in the device designation if the adapter
> upon which the device is located.  If there are two adapters, this is
> either A or B.  The 'n' is the device number.  Unless you're looking
> as a dvices served from a storage controller, the sub-LUN vallues are
> 0.  So on your MicroVAX, you see somehting like a DKA300: for a disk
> addressed as SCSI id 3 on the A adapter.
> If you need more info, ask.

This applies exactly, thanks.

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