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Admiral Kenobi

Air Raid vertical hold issue

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I have just received my Harmony cart and it is wonderful. the only game I have issues with is Air Raid by Menavision. The game keeps scrolling up and down (like a vertical hold failure on an old t.v.)

 

The rom plays fine on the Stella emulator and I've downloaded the rom from two locations - both have the same problem on the Harmony cart. Can this be fixed?

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Air Raid displays 290 scanlines, which is way out of specs for NTSC (262 scanlines). Some TVs can sync to this and some can't.

 

Bad luck.

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Yes, but Artillery Duel has the opposite problem, way too few scanlines (241).

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I tested it on another television and the game worked fine; is there anyway to compensate for this? The Harmony manual only suggested changing the file extension...

 

It's not possible, even less with the big difference in scanlines count.

 

I've same problem with an original Atari Asteroids cartridge (the only one that cause me problems,) in one TV it works just fine and in another it rolls screen ocasionally.

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I tested it on another television and the game worked fine; is there anyway to compensate for this? The Harmony manual only suggested changing the file extension...

It's important to note that Air Raid's screen rolling is due to a programming error in the game itself. The original cartridge would have the same issue. The only way to fix it would be to fix the game itself. I'm not sure if that's ever been attempted.

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