1. A test vector manager for use with a unit under test (UUT), comprising: a gateway device coupled to the UUT and configured to provide a testing pathway for the UUT to coordinate test requests and responses for a backplane multi-drop test bus; a test memory coupled to the gateway device and configured to retrieve version-specific test vectors, which are resident on the UUT and correspond to the test requests; and a chain configuration logic unit coupled to the test memory and configured to return the version-specific test vectors to the backplane multi-drop test bus employing the testing pathway.