The Trial tuner (that was sold with Sim2 boxes), was only 1 tuner simultaneously (it would switch from S, to T or C). I seen drivers only for DM800HD (if I remember well) and DM800HDse/V2.

If we talk about the DM9x0 Tuner, based on ST Chipset (also useable on DM800HDse), it's a Dual Tuner, not triple, you choose between T or C for the second one. It has 3 inputs connectors, Sat + Terrestrial + Cable, but 2 Tuners, that you set to the one you want (Sat + Terr or Cable).

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