On 2021-05-20 5:05 p.m., Jonathan Stone via cctalk wrote:
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?
There's nothing special needed to write the disk -- just burn it the way
you would any other ISO image. It is the filesystem contained in that
disk image that determines block size.