This is the test card assembly and battery card for the Data Hiway Port.

This card can perform off-line tests on the DHP to verify proper operation of all functions of the DHP. These tests include instruction set tests of the CPU on the processor card and the CPU on the Comm Logic card, interrupt handling from the ROM card, hardware multipication from the ROM card, parity checking logic and read/write function on the CMOS RAM cards, and read/write RAM testing on the Comm Logic card. It also tests communication between the Comm Logic card and the Transceiver card, up to the port drivers of the Transceiver card. In addition to these logic tests, this card can perform a battery test to verify at least 4 hours of battery capacity in the on-board battery 30752948-001.