Mounting ULTRIX CDROMs on Linux
chris at groessler.org
Thu May 20 16:45:40 CDT 2021
More top-post alert! :-)
IIRC I had burned the Ultrix CD "normally" (means without fiddling with
block size, so not 512), but changed the block size to 512 for booting
it. IIRC #2, burning was done on another drive, not the Plextor.
On 5/20/21 11:26 PM, Jonathan Stone wrote:
> [[ apologies for top-post: Y! issue ]]
> I know that to be bootable on DECstation/VAX/early Alpha, CD-ROMs
> needs to be jumpered to 512-byte blocks. Like RRD4x.
> Does the burning CD write need to be jumpered to 512-bytes? Or can one
> write on a "normal" CD burner, then read on a 512-byte-block CD-ROM ?
> If the former, I guess I'll have to find an old, 512-byte-block
> jumperable SCSI CD burner.
> On Thursday, May 20, 2021, 02:15:39 PM PDT, Christian Groessler via
> cctalk <cctalk at classiccmp.org> wrote:
> On 5/20/21 11:05 PM, Jonathan Stone via cctalk wrote:
> > MacOS (Mojave) can mount an image read from a 512-byte UFS CD.
> > What does one have to do (Linux, MacOS, *BSD) to write such an image
> to the CD with 512-byte blocks, so it can be read by a DEC boot-ROM?
> I think that's a property of the CD drive, not the disk itself.
> I've got a Plextor CD writer which can be jumpered between 2048 and 512
> byte blocks.
> I was able to boot the Ultrix installation CD (MIPS) on a DECServer.
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