Description:
NuBus card provides Intel i860 processing environment with dedicated RAM and serial port. Unimplemented second port, also maybe SCSI? More information needed. Likely a prototype board.
Identifying Numbers:
RAVEN  REV A.2 ECO 68i; Mnt.2ACE (ROM); CR-40E7 (ROM)
Onboard logic:
Intel A80860XR-40 L2193777 SX438; AMD Z85C30-10PC; AMD AM27C256 -200DC (x2) (ROMs)
There are more chips beneath the ROMs.