QSI controls

AFAIK, the QSI boards and the MTH Protosounds boards never had a smoke control option.  The smoke units on all of those are stand-alone and run from track power.

So what does the QSI control if not sound and smoke ?

The full QSI 3-stack board sets controlled sound and motor.  Later ones had the electrocoupler option like the MTH Protosound 2-board stack.  The thing that none of then controlled was the smoke.

QSI also sold the single board reverse unit with or without a horn board.

The suffix -0 means it likely has a  QSI DCRU reverse unit with an added whistle board.  It could be upgraded to PS1 if you could find a board and chip, but to upgrade to PS3 is $200 plus labor.

The DCRU is a basic DC motor reverse unit. It may have some add on items for directional light and markers.  The Whistle board could plug right into the top and work.  Or horn for diesel.

QSI set up did use that DCRU along with a center power supply board and a top board for more full sounds and conventional control.

MTH went with a two board stack and the bottom board on an MTH PS-1 has all the power supply items of the middle board QSI used.

Do a search and you can find more info.  G

Thanks for all the great info I’m still a babe in the woods. I was never a real train guy just a once a year Christmas layout wantabe. Now I’m planning my Christmas layout starting in July. Lol, however I’m trying to get everyone in the family into trains. It just such a broad field and you diffidently need to do your home work prior to buying. So thanks for explaining.