Please add an auto switch option for videosource. This would make it easier to use for average users and for host systems without a keyboard (handhelds running openMSX ports).
The algorithm would be the following:
1) The default selected source at boot time would be the MSX internal VDP
2) When the first I/O is detected to the V9990 or secondary-V99x8 I/O ports, the video source is automatically switched to that VDP.
3) The video source would automatically reset to the internal VDP upon reset.
Of course the user could still manually select either video source if he desires so.
The videosource options would then be:
set videosource auto
set videosource MSX
set videosource MA-20(V)
set videosource GFX9000
set videosource Video9000