CDU-710/M disk controller
From Computer History Wiki
The CDU-710/M is a UNIBUS SCSI disk controller made by CMD Technology Inc.. It fits in a quad Small Peripheral Controller slot. It support's DEC's Mass Storage Control Protocol.
4.3BSD Quasijarus bootstrap bug
When booting 4.3 BSD Quasijarus, there is a bug (although VMS, NetBSD revisions above 1.6 or so, and Ultrix-32 all boot fine); it hangs inside udcmd() in sys/vaxstand/uda.c.
The fix is to change line 155 from:
if(u->uda_ca.ca_rspint == 0)
to:
if(u->uda_ca.ca_rspdc & MSCP_OWN)
Re-build the bootstrap, and then run disklabel to update the copy on the disk.
