This is the ROM board for the original Data Hiway Port, the DHP I.

Honeywell suggests that existing DHP I Data Hiway Ports be upgraded to the DHP II. The current version of the DHP II uses ROM board 30751044-010 and Comm Logic board 30752787-003.

This old ROM board for the DHP I must be used with Comm Logic board 30752787-001.