hi jclampy:
I notice the problem too, I play the 'King of Fighter' series with standard and I feel there is some distortion with the picture, but I am not sure about that.
then I launcher the SEGA Dreamcast emulator to boot the 'King of Fighters Evolution, The v1.000 (2000)(Agetec)(NTSC)(US)(M4)[!]' GD-ROM to see the difference.
I use the PrintScreen button to snapshot some of game pictures of both MAME and SEGA Dreamast edtion. I compare the pictures. and what I find is that:
when use 'pixel aspect ratio' in MAME, the ratio of the pictures that I snaped is match the SEGA Dreamcast edtion. but when use 'standard aspect', it is obvious to find the distortion of the pictures.
I know that the 'King of Fighter' series also release on sony PlaySation. I will test it and post the result when I done.
I know it is not a real arcade picture ratio that I confirmed, but I hope this helps.
Also sorry for my english as I am from a non-english spreaking contury.
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