[Info-vax] rx2600s on eBay

[vaxinf at chemie.uni-konstanz.de]

On 25 Mrz., 09:06, glen herrmannsfeldt <g... at ugcs.caltech.edu> wrote:
> vax... at chemie.uni-konstanz.de wrote:
> > It's impossible to boot from a SCSI-DVD or SCSI-Acard-IDE-DVD
> > because the drive only understands 2048 block commands whereas
> > VMS wants 512 Byte blocks per I/O.
>
> Last time I did a VAX/VMS install I tried a CD-ROM
> drive with a 512/2048 jumper and it still wouldn't
> install.  I then copied the whole CD to a SCSI
> hard drive and it installed just fine.
>
> I also have SCSI CD-RW drives with such jumper, but
> I might not have had one at that time.  
>
> SCSI DVD-ROM or DVD-RW drives may or may not
> have that ability.  Small SCSI hard drives are
> pretty easy to find and reasonably priced.
>
> -- glen

The famous 512/2048 jumper is only used if you put a CD-R(OM)
into the drive. As soon as you put in a DVD the 512/2048 jumper
is ignored and the drive switches to the 2048 mode VMS cannot handle.
This is been tested with a Pioneer Slot-in SCSI DVD drive.

It might be different with other drives.

Eberhard