The MB86965B EtherCouplerTM Ethernet Controller is a highperformance, highly integrated monolithic device, a superset of the Fujitsu MB86965A, that incorporates a network controller with buffer management, Manchester encoder/decoder, 10BASET transceiver with onchip transmit and receive filters, and bus interface for a PC/XT/AT/ISA bus. New features of the MB86965B not present in its predecessor, the MB86965A, are summarized below. The EtherCoupler allows implementation of adapter solutions with as few as four chips. With its optional generic bus mode, it is suitable for use directly on a microprocessor bus, local bus or expansion bus. A serial EEPROM can be interfaced to the chip for storage of Ethernet ID and configuration settings. The EtherCoupler is designed to be configured electronically, thus eliminating the jumpers typically used to configure system network adapters. When either the reset pin is activated, or a `software reset' is issued by writing any value to any onchip address in the range x18 to x1F(hex), the MB86965B will download three essential configuration parameters from the EEPROM to BMPR19. New Features of the MB86965B EtherCoupler Fullduplex capability