Re: CD drives on vax

[Dave McGuire <mcguire%neurotica.com@localhost>]

On 06/21/2012 07:41 PM, David Brownlee wrote:
>>> So, currently looking at Martin's racd as the best name unless there
>>> are any other suggestions?
>>
>>  Chiming in late here...IF there's any way to distinguish, it'd be
>> great to have it as consistent with other ports as possible.  Viewing
>> the OS and its drivers as the "abstraction layer" that sits atop the
>> hardware is how I'm envisioning it.  Is there no way to accomplish this
>> without violating the OTHER abstraction layer that is MSCP?
> 
> cd* is a specific device that sites on top of a scsipi layer.
> Abstracting that would probably require a scsi+atapi+mscp abstraction
> which would sit on top of scsi, ata or mscp.
> 
> Could be an interesting project, but a little out of scope for what I
> had in mind :)

  Ahh ok, I understand.  Thank you for the clarification.

> My simh now boots with:
> 
> ra0 at mscpbus1 drive 0: RA92
> racd0 at mscpbus1 drive 1: RRD40
> ra1 at mscpbus1 drive 2: RD54
> rx0 at mscpbus1 drive 3: RX50
> ra0: size 2940951 sectors
> racd0: size 1331200 sectors
> 
> and as a nice bonus I've copied the cd* behaviour of defaulting to a
> single iso9660 partition for CDs without disklabels:
> 
> # disklabel racd0
> # /dev/rracd0c:
> type: MSCP
> disk: RRD40
> [...]
> 8 partitions:
> #        size    offset     fstype [fsize bsize cpg/sgs]
>  a:   1331200         0    ISO9660       0             # (Cyl.      0 -  
> 10399)
>  c:   1331200         0     unused      0     0        # (Cyl.      0 -  
> 10399)

  Nicely done!

             -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA