Abstract: A computer interface adapter is provided to support data communication been a parallel signal device operating at the MIL-STD-1397B Type B interface and a serial signal device operating at the MIL-STD-1397B Type E interface. A first converter, connected to the input and output channels of the parallel signal device, converts parallel format data between the Type B voltage level and a standard transistor-transistor-logic (TTL) level. A second converter, connected to the input and output ports of the serial signal device, converts serial format data between the Type E voltage level and the standard TTL level. Staging memory is provided to temporarily store parallel format data at the standard TTL level. A parallel-to-serial converter converts parallel format data in the staging memory into serial format data at the standard TTL level and passes same to the second converter.