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I then started the cpu20_xxdp_rl0_dl11.sh script to get the Unibone to emulate a CPU and a DL11 serial port. This now boots xxdp. I then start ZRXBF0ZRXFB0.BIC which should test the controller:
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This test starts by calling the Supervisor. This prompt takes a set of possible answers explained here. After answering STA/FLAGS:HOE (start test, halt on error) the test reports the following:
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Look in Jörg Hoppe’s fantastic diagnostics database here and find the test in question to get the assembly listing for the thing.