Posted by Mike-Tech

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Wouldn't it be better if you open up a normal smb2 rom and find the hex where birdo is spitting ?
Disable the background, music and 1 other foreground layer, you should be able to find it and reapply the original code to your hack.

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Posted by Quick Curly

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I haven't touched SMB2 in years, and I never really got far with it compared to you and others who have actually successfully hacked it in the past, so I'm not sure if this is exactly what you're looking for, but I found this data on Data Crystal.

0x004FC3 - Birdo's spitting time 0x0055A3 - Snifit's spitting time

Looking in the ROM, the original value for 0x04FC3 is 1C.
The original value for 0x055A3 is 30.

The lowest that I could decrease 0x04FC3 to was 08. Any lower, and no egg would even spit out of Birdo. A higher value made the time before Birdo shot an egg out after opening its mouth longer, as high as 87. At 88, again, no egg would shoot out.

I tested out changing 0x055A3 in 1-2 and at the beginning of 1-3. The gray Snifit (which simply jumps up and down in place) in 1-2 was unaffected by any changes.
The pink Snifits in 1-3 were affected. A value of 00 prevented them from spitting out any bullets.
A value of 01 seemed to be a faster spitting speed.
A value of FF caused the Snifits to shake for a long time before spitting out bullets, seemingly only while the player was standing in front of them, and not behind them.
A value of 80 seemed to be a little slower spitting speed.

Now, I see that these offsets are for the timing, and not necessarily how fast the eggs or bullets travel across the screen. I couldn't really tell from testing if these offsets have any such effect (though I assume they don't), or if there are other offsets elsewhere that you could change to affect the speed that the eggs and bullets move after getting spit out.

You could try using the Code/Data Logger in FCEUX or FCEUXD to see if any other bytes/offsets nearby light up while Birdo and Snifit are on the screen spitting, or like mrrichard999 suggested, comparing the files with Hex Workshop or WindHex32 will show differences between two files, and you could search around the above offsets to see any other bytes that differ, and test them out to find out if any do what you're looking for, or even post screenshots and the results here for anyone else to possibly take a look.

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Posted by RetroRain

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Googie, if you're reading this, I thought of you when I decided to do the mapper conversion of TBBCC. I know how much you like to hack games like that. And now that it is MMC5, you can maximize the PRG to 1MB, and the CHR-ROM to 1MB, since the game already uses CHR-ROM!

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Posted by Mega-Dog

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What is this Googie back from the grave like I am at times?

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