The 386 processor was never manufactured with an inbuilt Maths Coprocessor, they were seperate chips.
This board however was not supplied with the coprocessor.
This RM board was somewhat rare in that it had the ability to support 2 different types of coprocessors:
U201 = 121 Pin EMC socket for an Enhanced Maths Coprocessor, eg Weitek 386 FPU Abacus 3167
U202 = 68 Pin 80387 Processor, eg Intel A80387DX-16-33 or IIT 3C87-25