I've successfully booted both my HP 9000/380 and 425e systems from a Toshiba SD-M1711 DVD-ROM drive jumpered to 512 byte/sector mode.
In my case I was using CD images provided by David Collins from hpmuseum.net. The boot CD image that I got from him has the same md5sum as the hpux9_install.iso image that I just downloaded from bitsavers. I didn't need to do anything special to burn it or boot from it. It just worked. On 2018-07-06 12:49 PM, Al Kossow via cctalk wrote: > Couple of related things, does anyone have a list of SCSI CDROMs known to > boot on the 68K 9000s? > I've ordered another A1999 to see if my drive is just bad, and have started > digging through my > boxes of drives for other models to test.