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Thank you everyone for your help.

I need to preserve the original left bits, while being able to properly compare then alter the right bits. I hope that makes sense.

@Shiru, your example worked thank you!

One more question How do you compare a bit? Id like to see if a hex value matches #8, and if it does, to branch to whatever i want.

In my routine, I am able to load a register, use AND, and the value is changed. But after that, ill do the same with another register, and the value does not change.... Example LDA $70 ;46 is in $70 AND #$F0 ;i use this for checking bits, I want to make the (6) in the value (46) to 0, so now the val...

Here is my updated patch set. I also included an mmc1 doc, im no expert, but ive had some success.

http://acmlm.kafuka.org/uploader/get.php?id=4475

Ill try again then, thank you!

Edit. Just to clairify in the clearing of registers 2 & 4, and the setting of registers 3 & 5, thats for $8001 correct?

Edit 2 - Works! Got the rom cycling through the different mirrorings! Thank you for the explaination!

Thank you for the info.

Yes I use fceux debugger, emu version 2.2.1 im not getting into a debate on why im converting roms to mmc3, its a new personal challange is all it is. Im moving on, not bothering with it anymore. Edit - Actualy I took the cheap way out. I bypassed the ufo sequence, and I have the rom jump straight t...

This is my custom chr engine asm i wrote up, which is to preserve the original mmc1 chr values loaded by Fester's Quest, and then converted to the proper mmc3 chr values. I've done this was about 5 mmc1 roms with no issues, it's just that this rom is set up specificly for vertical mirroring for the ...

I have a 20 byte chr pointer table. Values range from 00,04,08,0C,10,etc, up to 7C.

I increased the values through the table by 80. The ppu shows the correct gfx, but the nametable switches to Single Screen (Table 1) not to Vertical mirroring.

I have "A980 8D0080 A93C 8D0180 8D0180 8D0180 8D0180 60" but I see no change, I also tried 00-FF for 8D0180 and still no change.

Ive converted Fester's Quest from MMC1 to MMC3_118. The gameplay requires 1 screen mirroring, so thats whyi had to switch to 118, cause mmc3 lacks that mirroring type. The problem im having, is that im unable to force vertical mirroring within 118, which the pre-title screen requires to be drawn pro...

Workin on a guide on how I convert (specificly) towards MMC1 to MMC3, regarding CHR, and bankswapping.

Ok, I have Ninja Gaiden working as MMC3. Tested and working on the following emulators. FCEUX Nestopia Nintendulator (with some shaking issues. Can others please confirm?) Also tested and working on my RetroPak for my NES. Ive only played up to Act III on all devices. But everything leading up to Ac...

Ninja Gaiden MMC3 is about 95% complete. Need to figure how to have the text for both the cutscenes and the in-game hud, to display correctly. The text shows up as whatever tiles are stored currently in the ppu, they get fetched from somewhere else in the rom. Its been a long time since ive worked w...