Mounting ULTRIX CDROMs on Linux

Christian Groessler chris at
Thu May 20 16:15:23 CDT 2021

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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