Control device using TTL level signals

I want to control an electronic switch that needs a couple of TTL level signals. It is possible to use a Sun for this? I was thinking about programming the parallel port, which has in the past been used in PCs, but I'm not sure how easy it is on a Suns - I have a feeling it is not so easy.

Suns available include a SPARCstation 20, Ultra 60 and Netra T1. Speed is not an issue and I dont mind sticking a transistor on the output if needed.
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