On 2018-12-15 20:20, Harold Bell wrote:
I am mucking around with focal69 and when it initailizes it seems to refer to 
non existent io device numbers  I can't find any google references to.  What is 
the normal procedure when the cpu runs into a reference to an io device that 
does not exist?  Thanks for any guidance.

What do you mean? Is the question about what the CPU does if it tries to do operations on a non-existing device, or how you would figure out what type of the device the code is trying to muck around with, or something else?

  Johnny

--
Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: [email protected]             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol
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