Not as such. The RH11 was not replicated on Q Bus because Q-Bus was made for small disks for a long time and I think DEC didn't want to undercut the sale of Unibus. That said, I have run into 11/23 systems that used RM02's with a Plessy Quniverter. Works fine enough, but only 18 bit memory support of course which kind of does suck. The more common thing to do was run something like an Emulex SMD controller which could handle 22 bits (you did have to patch the drivers in RSX I think) and could run all sorts of devices (which did need solid patches). Or just run a proper MSCP controller, pref one with burst and block mode DMA (which could exceed the speed of the Unibus controllers). C On 5/9/2024 7:10 PM, W2HX via cctalk wrote: