Odd board in a pdp8/e

[Chris Zach via cctalk]

I'm putting stuff together here and it's time to begin working on the 
8/E. Looks like a pretty generic system but it has two odd boards.

Pair of g227 memory boards, 4 board CPU+Console board, serial board, 
nothing too special.

But two odd Omnibus cards: One is a memory board, half populated, my 
guess is it's enough memory to bring the computer to 32kw. The other is 
an mets 303-0115-001. Bunch of 7400 series logic chips, nothing too 
special.

Any idea what it might have been? Timeshare option? Something else? Not 
a peripheral controller from what I can see.

C