Slowdown when rotating vertical games on horizontal cab

[xga]

Hi Guys,

Whenever I play any vertical games (think 1942, Raiden etc) in my horizontally mounted cab, the music and sound stutters a bit.  Pressing F11 to bring up the speed display shows that the game is running at a constant 95%.  If I rotate the game 90 degrees so that it is running at its native resolution (side on in my horizontal cab), the speed is at a constant 100%. 

Is there anyway to have vertical games rotated on a horizontal set-up to run at 100%?

Cheers

[Calamity]

Is there anyway to have vertical games rotated on a horizontal set-up to run at 100%?

Enable -multithreading in mame.ini.

[xga]

Thanks heaps, Calamity!  That fixed it.

Off topic, have you managed to get your Polostar CRT monitor repaired yet?

[Calamity]

Off topic, have you managed to get your Polostar CRT monitor repaired yet?

It's in the repair service since last tuesday, still no news. 

[xga]

It's in the repair service since last tuesday, still no news. 

Hopefully you have it back and all fixed very soon.

I've discovered another issue with rotating a certain vertical game (Twin Cobra).  Twin Cobra is a standard resolution (15kHz) game with a native resolution of 320 x 240 @ 54Hz.  When I rotate it through Groovymame on my horizontal monitor, Switchres selects the resolution of 1232 x 512p @ 54Hz forcing the resolution to high res (31kHz).  The game speed runs perfectly at 100% after enabling multithreading, but the game looks wrong as you lose the look of the scanlines in 15kHz.  Is there a way to have it work in a 15kHz resolution whilst rotated?  Not sure if it matters, but I'm using Win XP Pro x64 with magic resolutions.

[cools]

Simple answer - no.

[Calamity]

Is there a way to have it work in a 15kHz resolution whilst rotated?

You'd need an interlaced mode for that, which GroovyMAME is assuming you'll hate. The fact is 320p is way above 15 kHz.
If you want to try create a twincobr.ini file and inside it select 'monitor arcade_15'. That will force an interlaced mode. If you also put in it 'interlace 0' it will use a 15 kHz progressive mode, stretching things so that it fits in less lines.

[xga]

Thanks for your replies cools and Calamity.

Calamity, I created a twincobr.ini with your suggested settings and sure enough it stretched the image of the game to work in 15 kHz.  After playing it for about 10 minutes and then going back to the 31 kHz suggested resolution by Groovymame, I decided that the 31 kHz is the better compromise.  What can I say?  Groovymame knows better than me!