Sets RR1_ALL_SENT on reset, previously it relied on tra_complete() being called after reset. It's no longer called if there has been no data sent.
Added a "-listdevices" option to nltool to list all available devices. Simplified code. [Couriersud]
It makes more sense to mask out the errors that are going to be brought in from the error mask rather than throw all the other bits away. However I haven't seen any documentation for Z80DART that says there is an error FIFO at all. [smf]
reverted gross hack (nw)