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Speed differences between versions of MAME
Haze:
--- Quote from: gman314 on March 03, 2013, 01:21:18 pm ---I agree about what you said regarding Final Fight. Upon further inspection, both versions seem identical. Last night I was playing both versions of TMNT again, and the speed seemed identical to me as well. The only thing that I still notice is that slight graphical difference where the screen seems slightly "shifted ".
Any other notable games with slight differences like this?
--- End quote ---
There are probably a few.
When drivers are first done (especially in the past, with few references) visible areas were usually chosen based on what resulted in the least garbage on the display, ie what the games seemed to expect.
For some that actually turned out to be wrong, and that garbage towards the edges of the screen was present on the original hardware. TMNT is one such case IIRC and the resolution now properly represents what the board would put out, even if there are some parts will now have some ugly artefacts near the edges of the screen. You're unlikely to find a list of cases where tweaks like this have been made, but MAME is constantly trying to be more like the original boards wherever possible, and this is just one such example of that.
paigeoliver:
But on the original hardware wouldn't the ugly artifacts at the edge of the screen be adjusted off screen with the monitor controls?
--- Quote from: Haze on March 03, 2013, 10:44:06 pm ---
--- Quote from: gman314 on March 03, 2013, 01:21:18 pm ---I agree about what you said regarding Final Fight. Upon further inspection, both versions seem identical. Last night I was playing both versions of TMNT again, and the speed seemed identical to me as well. The only thing that I still notice is that slight graphical difference where the screen seems slightly "shifted ".
Any other notable games with slight differences like this?
--- End quote ---
There are probably a few.
When drivers are first done (especially in the past, with few references) visible areas were usually chosen based on what resulted in the least garbage on the display, ie what the games seemed to expect.
For some that actually turned out to be wrong, and that garbage towards the edges of the screen was present on the original hardware. TMNT is one such case IIRC and the resolution now properly represents what the board would put out, even if there are some parts will now have some ugly artefacts near the edges of the screen. You're unlikely to find a list of cases where tweaks like this have been made, but MAME is constantly trying to be more like the original boards wherever possible, and this is just one such example of that.
--- End quote ---
Haze:
That is the correct solution for getting rid of them without screwing up your screen timing, yes.
--- Quote from: paigeoliver on March 04, 2013, 11:51:38 am ---But on the original hardware wouldn't the ugly artifacts at the edge of the screen be adjusted off screen with the monitor controls?
--- Quote from: Haze on March 03, 2013, 10:44:06 pm ---
--- Quote from: gman314 on March 03, 2013, 01:21:18 pm ---I agree about what you said regarding Final Fight. Upon further inspection, both versions seem identical. Last night I was playing both versions of TMNT again, and the speed seemed identical to me as well. The only thing that I still notice is that slight graphical difference where the screen seems slightly "shifted ".
Any other notable games with slight differences like this?
--- End quote ---
There are probably a few.
When drivers are first done (especially in the past, with few references) visible areas were usually chosen based on what resulted in the least garbage on the display, ie what the games seemed to expect.
For some that actually turned out to be wrong, and that garbage towards the edges of the screen was present on the original hardware. TMNT is one such case IIRC and the resolution now properly represents what the board would put out, even if there are some parts will now have some ugly artefacts near the edges of the screen. You're unlikely to find a list of cases where tweaks like this have been made, but MAME is constantly trying to be more like the original boards wherever possible, and this is just one such example of that.
--- End quote ---
--- End quote ---
Gray_Area:
god, it took me several minutes and such, constantly refreshing the page, to find this one.
"Let's start with the [NeoGeo] games that have garbage in the overscan area - no other company allowed games out the door with problems that major, and on consoles you would be denied manufacture by Sega/Sony/Nintendo/Microsoft if you had an error like that. Only Midway/Williams can even begin to compete with the NeoGeo for sheer bugginess of games."
- R. Belmont