31.5 kHz Interlaced Modes

[pacboy]

Maybe a stupid question, but why do all of the monitor presets have 0 and 0 for InterlacedLinesMin and InterlacedLinesMax the 31.5 kHz crt ranges?  I'm using the arcade_15_25_31 preset, so the highest resolution video mode that it creates is 2560x768x60i (a 25.0 kHz mode).
I'm thinking that vector games would look best using a 31.5 kHz interlaced mode since they look better with higher resolutions on raster crt monitors.  If I want to make a custom preset to create these high-resolution interlaced modes what numbers should I enter for the min and max?  I'm using a Billabs BL25C90T.

[Calamity]

I agree, but I made those 0 because otherwise very high interlaced resolutions were created and most people don't like that. Just use the double of the progressive values for the interlaced fields, it'll work.

[pacboy]

OK, did that and VMM makes the hi-res modes 2560x800_60i and 2560_960_60i.  When I try to test them in Arcade OSD nothing happens when hitting 5/player 1 coin.
When I run vectors from GM switchres changes the desktop to the hi res, then GM crashes.  I get the impression that this monitor doesn't like anything over 2560x768_60i (25.0 MHz), which works fine.  I'll post a GM log when I get a chance.  Thanks for the advice!

[pacboy]

Playing with Arcade OSD again it looks like my hi-res modes do in fact work and are stable.  I needed to "set as desktop mode" to enable the mode to check that it works.

I created and checked a vector GM log against a raster game log that works, and they are both successful.
When I run GM from the command line to create the log, I get this error:

"Unable to create the Direct3D device (8876086C)
Unable to initialize Direct3D 9
Fatal error: Unable to complete window creation"

Any ideas what's causing that error?

[pacboy]

Sorted that out by adjusting settings.  So the vector games look similar in 480p, 768i and 960i.  The horizontal vector lines are really thick.  I played with all of the adjustments and nothing seems to have any effect on the height of the horizontal lines (the width of the vertical lines with a vertically mounted monitor).  Is that adjustable?