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NTSC test, help needed


Schmutzpuppe

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Hi folks,

 

I wrote a little game that runs smooth on pal but doesn't look that good when using emulator in NTSC mode.

Could someone check if the scrolling mess up on original Atari NTSC hardware?

I only have a pal Atari :(

Here is the link: http://starbase.globalpc.net/minigame/GAME.../Superfly1k.zip

 

Thanks in advance

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There is no run or init address information in your exe file.  

 

Yeah, I just looked at the file and made the same patch to it too (is that your Charset at $5000?), and I got the same occasional jitter. How are you timing your updates?

 

Is Atari800Win just assuming the start address is the beginning of the file?

 

-Bry

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Thanks bryede.

 

I did some modifications, scrolling looks good now (on emu) but maybe resolution is to high.

Could you try again with the new file?

You can find it here:http://www.atari8bit.de/superfly.zip

 

That one works fine on my 800XL. The color is different, though.

 

-Bry

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Ups, didn't read the new posts, right, I didn’t use a run or an init address.

You can boot the ATR direct; the disk contains a "minidos".

The game is now short enough so that I can add a run address (don’t want to go over 1024byte).

But more important is that the game itself works on ntsc (beside the init/run problem).

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That was quick, thanks :)

Playfieldcolor is differend every game btw.

Ahh. That explains it. So what was the scroll problem?

 

The hole game logic runs during vertical sync, guess on NTSC wasn't enough time to draw the hole playfield in the blank.

I just put the playfield code at the beginning of the VBI and speed up the code a bit.

 

I'll add a run address and post the new version.

Thanks a lot.

No problem! It's nice for a 1K prog.

 

-Bry

 

thanks :)

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