Super Sprint missing lines

[outrunner]

Hi, I’ve noticed that when playing Atari games like super sprint and paperboy part of the top and bottom of the screen is missing. This isn’t just that the lines are there but off the screen because if I manually adjust the vertical stretch on the TV I just get black borders. Is this expected behaviour running these games with Groovymame on a standard Scart TV or should I be able to adjust the settings to get these games to show all of the lines?

Thanks.

[Calamity]

Hi outrunner,

You can easily see the resolution picked by GM in the Game Info submenu. If it's picking the right height, then the lines should be there.

Many "modern" TV chassis may do things like cropping lines above 240, etc., this is a known issue.

It could be, however, that GM is using interlaced resolutions for those games, and picking the highest possible height for the given refresh in order to provide better resolution. If that's the case, then it's a matter of reducing the InterlacedLinesMax value in a custom crt_range line.
 

[outrunner]

Thanks for the response Calamity. Yes these games are running in interlaced mode. I'll hopefully get some time this weekend to have a play around with a custom crt line. Should I create the custom line in vmaker.ini and mame.ini ?

[Calamity]

Thanks for the response Calamity. Yes these games are running in interlaced mode. I'll hopefully get some time this weekend to have a play around with a custom crt line. Should I create the custom line in vmaker.ini and mame.ini ?

You only need to do it in mame.ini. For instance:

crt_range0    15625.00-15900.00,49.50-65.00,2.000,4.700,8.000,0.064,0.192,1.024,0,0,192,288,448,512

This setting will limit the max interlaced total lines to 512. Play lowering it until you find the right value.

[outrunner]

Thanks Calamity.