NROM ROM images with more than 2 PRG ROM or 1 CHR ROM

Discuss emulation of the Nintendo Entertainment System and Famicom.

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Petruza
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NROM ROM images with more than 2 PRG ROM or 1 CHR ROM

Post by Petruza » Sun Jun 21, 2015 3:51 pm

The wiki says that NROM (Mapper 0) cartridges have 1 or 2 16KB PRG ROMs and 1 8KB CHR ROM.
But by watching into the iNES header of my collection of NES ROMs, I see that many mapper 0 ROMs actually have up to 7 of each.

Is this right?
is there some bank switching going on for mapper 0?
if so, how?

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thefox
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Re: NROM ROM images with more than 2 PRG ROM or 1 CHR ROM

Post by thefox » Sun Jun 21, 2015 4:13 pm

You're probably misinterpreting the header. Check the sizes of the files; they should be between 24 (16+8) to 40 (32+8) KB. If they are, you're misreading the header. If not, they're not NROM ROMs.
Download STREEMERZ for NES from fauxgame.com! — Some other stuff I've done: fo.aspekt.fi

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Petruza
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Location: Argentina

Re: NROM ROM images with more than 2 PRG ROM or 1 CHR ROM

Post by Petruza » Mon Jun 22, 2015 9:25 am

Oh yes, you're right. Upon closer inspection, all these games are the ones known as sachen
Their headers report having mapper 0, 7 PRG ROMs and no CHR ROM.
Thanks!

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