It turns out that, when the IRIX header files mention CTR/DCD/DTR/RTS wiring

is inverted on Indigo, this just means that Indigo does not use the same
values as the later models. It does not mean that the Indigo is using wrong
values, which is how I first read this. In reality, Indigo systems use the
expected values of these signals being active low, while later designs
use active high signals.

So yes, some systems have inverted values - but the ones which need
compensating are not those I thought.

Change the logic to do TRT, but keep the device flags check, to be able to
force the other behaviour if the kernel guesses wrongly. Tested on Indigo,
Indy and Indigo 2.

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