CXDLBB0

DXDLR is an IOMOD that exercises one DL11-E Asynchronous Communications Interface (M1800). The program consists of two major sections as described below:

• Section one:

The first section consists of a logically sequenced set of static register tests to verify the DL11-E hardcore required to perform input/output data transfers in interrupt mode. Errors detected in this section that are determined to be fatal are reported via the standard DEC/X11 error printout and then the module is dropped from the exercise. Non-fatal errors are simply reported and then the program continues in normal sequence.

• Section two:

The second section transfers 256 byte blocks of data using the maintenance mode to turn the data around. The 256 bytes output are compared with the 256 bytes input for data comparison errors. All data comparison errors are reported on the console device.