On Fri, Dec 4, 2015 at 8:32 PM, William Donzelli <wdonzelli at gmail.com> wrote: > What is a DD11B backplane for? > > -- > Will > It is a DP11 Peripheral Mounting Panel 4 spc slots 2 df11 slots reference pg 4-68 through 4-71 of the Digital peripherals handbook 1973-1974. DF11 is the serial line interface. -- Bill