Any info on a Western Peripherals DC-230 disk controller?

[Josh Dersch]

Any ideas what this disc controller is?

https://www.ebay.com/itm/PDP-11-Backplane-Western-Peripherals-DC-230-Disk-Controller-DEC-Digital-PDP/353417412426

Can't find much about this on the 'net, other than that it was a controller
for Diablo/Pertec style drives -- no idea if it's an RK11 clone or
something else entirely. Looks to be suitable for a PDP-11/20 given the
little notch missing from the side there, and the lack of a separate power
harness for the backplane.

- Josh