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I'm adding the FDX floppy device to the machine MTX512. The FDX device contains an 80 column video card (for CP/M) which has a monitor output. This monitor output is completely different from the VDP output of the base MTX512 machine.

I currently have the FDX adding another SCREEN (controlled by a 6845), so when I add the FDX device I now have two SCREENs (side by side). When the FDX is running there is no output from the VDP to the first SCREEN. Is there a way of removing the root SCREEN when I add the FDX SCREEN?

Not currently. I'd like to be able to do that for exactly this type of case (e.g. add-on 80 and 132 column cards for the Apple II) but it's not supported ATM.

you can add a video layout which shows only a single screen and let the user choose which screen to display through the "Video Options" menu.
it's not optimal, but at least gives the user the possibility to remove the blank screen.

You don't need a special layout for that, that's already possible with the default two-screen-horizontal layout you get when adding two screens.

Hello etabeta78,

long time no see you.

Thanks, I really should've known that myself. The selected layout is also saved in machine.cfg which helps too.

It's actually possible to programmatically change which view is selected then too.

render_target *target = machine().render().first_target();
target->set_view(view);

where "view" is 0, 1, 2... in the order the options are in the layout. Some Macs use this because you can select either portrait or landscape video modes.

Exactly what I wanted, we got there in the end