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Another amazing gift from Geert, this is my first real DEC peripheral for the PDP 11/44!! Yay!

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Running tests for the controller

I inserted the M8256 controller in an Unibone testbed (see here how to set that up):

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 ZRXFB0.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.

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