Very quick mapper question

Very quick mapper question
by jwdonal on 2009-08-29 (#50294)

Hey guys! I've got a quick question regarding mapper number assignments. There seems to be a bit of conflicting documentation - as with much of the NES docs. LOL.

First, Marat Fayzullin (the original creator of the .NES file format) states that mapper #2 is CNROM and mapper #3 is UNROM. See here:
http://fms.komkon.org/EMUL8/NES.html#LABM

But the mapper list created by firebug says that mapper #2 is UNROM and mapper #3 is CNROM. See here:
http://tuxnes.sourceforge.net/mappers-0.80.txt

Who is right?? I know one of you guys have the "official" answer.

THANKS!

by Banshaku on 2009-08-30 (#50295)

I'm not an expert in mappers but the wiki should be the place with the latest information:

http://wiki.nesdev.com/w/index.php/INES

#2 seems to be UxROM and #3 CNROM. Other peoples can confirm later.

by Bregalad on 2009-08-30 (#50296)

On the first link the guy just switched names but not game exeples : Castlevania and Life Forces uses UNROM.

Aside of this this page seems to contain a lot of innacuraties so you'd probably want to take a distance from what is being here (WTF how could you damage the PPU by writing different values at $2001 ?)

by Memblers on 2009-08-30 (#50300)

Bregalad wrote:
(WTF how could you damage the PPU by writing different values at $2001 ?)

Haha, I remember that old rumor about setting more than one 'emphasis' bit. Actually now that I think of it, since some TVs don't like the $0D color, I wonder if setting the emphasis bits along with that color could make things any worse, or maybe push an otherwise OK $0D color signal over the edge on some TVs. Just idle speculation, but I'd think that little tidbit had to come from some kind of observation.

I bet most of that doc was written back in 1996 or so. That was great stuff at the time, but mostly of historical interest these days. Makes me wonder too if Marat ever wanders by these forums.

thanks!
by jwdonal on 2009-08-30 (#50306)

thanks guys! you rock!