Re: SDI Disks

[Johnny Billquist <bqt%softjar.se@localhost>]

Also true. It's kindof a detail that might or might not matter. In the 
end, we're talking about MSCP disks here. They might be SDI, DSSI, CI, 
SCSI, MFM, or whatnot. Depending on what controller you are emulating, 
the port layer might look different, but that's independent of the MSCP 
layer. But UDA-style port layer is different than DSSI/CI port layer for 
example.

But if we're talking about the string that is printed as the disk type, 
that's actually a piece of information at the MSCP layer.

  Johnny

On 2026-05-03 18:08, Michael Thompson wrote:
> Technically RF drives are DSSI and RA drives are SDI.
>
> On Sun, May 3, 2026 at 11:32 AM Johnny Billquist <bqt%softjar.se@localhost 
> <mailto:bqt%softjar.se@localhost>> wrote:
>
>     On 2026-05-03 16:44, Andrew Ball wrote:
>      > I'm trying NetBSD/vax 11.0 RC3 on an emulated MicroVAX 3800. It
>     seems
>      > to work but I notice that ra0 and ra1 are reported as the wrong type
>      > of drive (RF31 instead of RF35). Thanks to mscp the sector counts
>     look
>      > good and NetBSD boots and seems to run without issue.
>      >
>      > -Andrew
>      >
>      >
>      >  From dmesg:-
>      >
>      > ra0 at mscpbus0 drive 0: RF31
>      > ra1 at mscpbus0 drive 1: RF31
>      > ra2 at mscpbus0 drive 2: RF31
>      > ra0: size 1664628 sectors
>      > ra1: size 1664628 sectors
>      > ra2: size 744400 sectors
>
>     The names are basically just strings returned from the simulator. They
>     have no relevance beyond being just a string that you can print out.
>
>     Size/capacity similarly is reported as what the actual capacity is,
>     without any regards to names.
>
>     So this is all just cosmetic, and it's a thing that you need to fixin
>     the simulator if you want it to say something else.
>
>     And really, any disk could just report whatever name. It's just a
>     string
>     that consists of 1-3 letters and a number between 0 and 127.
>
>         Johnny
>
>     -- 
>     Johnny Billquist                  || "I'm on a bus
>                                         ||  on a psychedelic trip
>     email: bqt%softjar.se@localhost <mailto:bqt%softjar.se@localhost>             || 
>     Reading murder books
>     pdp is alive!                    ||  tryin' to stay hip" - B. Idol
>
>
>
> --
> Michael Thompson

--
Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt%softjar.se@localhost             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol