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PostPosted: Sun Sep 16, 2018 5:21 pm 
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So, I grabbed some code off of github for a project someone wrote using the ophis assembler, and I wanted to change it so I can build it with ca65.

I'm pretty new to NES Dev, but I changed the code around and got an error in FCEUX saying "FDS BIOS ROM Image missing", but I'm not sure why it would think that I'm using the Famicom Disk System (I think that's what the message is telling me).

Any suggestions of what I should try would be really helpful.

Thanks

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PostPosted: Sun Sep 16, 2018 5:23 pm 
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Does your ROM have an iNES header? The lack of one could produce the FDS BIOS error message.

Could you post at least the linker script that you are passing to ld65, as well as the part of the assembly language source code that outputs the iNES header?

Or do you not know what any of the above means?


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PostPosted: Sun Sep 16, 2018 5:24 pm 
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As long as the thing that you've made looks like a NES file (first 3 bytes are "NES", not "FDS"), you shouldn't need the FDS BIOS.


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PostPosted: Sun Sep 16, 2018 5:38 pm 
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You guys are right... it was missing the header information. I've never used ophis, so I'm not sure what it did to include that header information.

It's still not working, but now at least it's not throwing the FDS error.

Thanks for your help

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