It is currently Fri Nov 16, 2018 9:48 pm

All times are UTC - 7 hours



Forum rules


1. NO BLATANT PIRACY. This includes reproducing homebrew less than 10 years old, with the exception of free software.
2. No advertising your reproductions, with the exception of free software.
3. Be nice. See RFC 1855 if you aren't sure what this means.



Post new topic Reply to topic  [ 23 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: donor carts
PostPosted: Thu Sep 22, 2005 7:51 am 
How do you know what donor carts to use when making your own cart? Such as that you need a zelda cart for Final Fantasy 2. Thanks!


Top
  
 
 Post subject:
PostPosted: Thu Sep 22, 2005 8:51 am 
Offline

Joined: Mon Sep 19, 2005 11:51 am
Posts: 17
You have to use a cart that has the same (or extremely similar) board. The Bigass NES Mapper list can help some:

http://tuxnes.sourceforge.net/nesmapper.txt

So if you're trying to make a FF2 cart (UNROM), you can use Skate Or Die, Pro Wrestling, Goonies 2, etc.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Sep 22, 2005 8:55 am 
Offline

Joined: Sun Sep 19, 2004 11:12 pm
Posts: 20775
Location: NE Indiana, USA (NTSC)
UNROM can't do SRAM, let alone battery-backed SRAM. Was FF2 really UNROM, or was it SNROM (similar to UNROM but using an MMC1, with its serial register load, instead of the discrete logic)?


Top
 Profile  
 
 Post subject:
PostPosted: Thu Sep 22, 2005 9:27 am 
Offline
User avatar

Joined: Fri Nov 12, 2004 2:49 pm
Posts: 7572
Location: Chexbres, VD, Switzerland
Ohmygod, FF2 is SNROM, like Zelda, Damn it !!

It has just been hacked to use mapper 2 (UNROM) for an unknow reason, and that is possible because the games uses only 16kb low bankswitching like UNROM does, and only uses Vertical mirroring.

The "hm-02" corrupted verision of FF2 has just been too much common, and now everyone (including myself before) is beliving that FF2 is UNROM. That's terrible, terrible, terrible !!

_________________
Life is complex: it has both real and imaginary components.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Sep 22, 2005 9:31 am 
Offline

Joined: Mon Sep 19, 2005 11:51 am
Posts: 17
I'm finding that a lot of documentation out there is misleading, inaccurate, or wrong. It's sort of frustrating, because there's so much knowledge built up in people's heads, but all of the stuff written down is wrong and it's not being corrected.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Sep 22, 2005 10:16 am 
Offline

Joined: Sat Sep 17, 2005 12:26 pm
Posts: 278
wow that is an awesome list. but what does okCHR mean?


rox_midge wrote:
You have to use a cart that has the same (or extremely similar) board. The Bigass NES Mapper list can help some:

http://tuxnes.sourceforge.net/nesmapper.txt

So if you're trying to make a FF2 cart (UNROM), you can use Skate Or Die, Pro Wrestling, Goonies 2, etc.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Sep 22, 2005 10:21 am 
Offline

Joined: Mon Sep 19, 2005 11:51 am
Posts: 17
That's a zero, not the letter 'O'. It means that the cartridge does not have any CHR ROM on the board -- it has "Zero K" of CHR ROM.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Sep 22, 2005 10:22 am 
Offline

Joined: Sun Sep 19, 2004 11:12 pm
Posts: 20775
Location: NE Indiana, USA (NTSC)
"0 KB CHR ROM" means that the game contains 8 KB or more RAM mapped into PPU$0000-$1FFF.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Sep 22, 2005 10:37 am 
Offline

Joined: Sat Sep 17, 2005 12:26 pm
Posts: 278
great!! now i know what games to look for. one more question: why do the eproms this guy soldered in do not fit into the cartridge?

http://www.zyx.com/chrisc/solarwarscart.html


Top
 Profile  
 
 Post subject:
PostPosted: Thu Sep 22, 2005 10:41 am 
Offline

Joined: Mon Sep 19, 2005 11:51 am
Posts: 17
Notice that he didn't solder the EPROMs directly to the board (which would be a bad idea anyway) -- he soldered two DIP carriers that he can snap the EPROMs into. However, there's not enough space inside the cartridge to accomodate a carrier and an EPROM, so part of the case needs to be cut away to make room.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Sep 22, 2005 10:49 am 
Offline

Joined: Sat Sep 17, 2005 12:26 pm
Posts: 278
so why cant you solder the eprom to the board? what is the best way to get the eprom in there without having to cut the cart?

rox_midge wrote:
Notice that he didn't solder the EPROMs directly to the board (which would be a bad idea anyway) -- he soldered two DIP carriers that he can snap the EPROMs into. However, there's not enough space inside the cartridge to accomodate a carrier and an EPROM, so part of the case needs to be cut away to make room.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Sep 22, 2005 10:53 am 
Offline
User avatar

Joined: Sun Sep 19, 2004 10:59 pm
Posts: 1440
coinheaven wrote:
so why cant you solder the eprom to the board?


You can, but then you can't easily remove them should you want to reprogram the cartridge with a different game.

_________________
Quietust, QMT Productions
P.S. If you don't get this note, let me know and I'll write you another.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Sep 22, 2005 10:59 am 
Offline

Joined: Sat Sep 17, 2005 12:26 pm
Posts: 278
ahhh, i see. i wasnt planning on doing that anyway, so it wont be a problem. ok now eproms, say i want to use Super Mario Bros. 3 for the donor cart, which has 256k PRG / 128k CHR, which type of eproms should i use? if i could have a list of all types (128k PRG, etc) that would be great.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Sep 22, 2005 11:00 am 
Offline

Joined: Mon Sep 19, 2005 11:51 am
Posts: 17
I wouldn't solder the EPROMs directly to the board for fear I'd destroy it in the process. Plus, once it's on there it's not coming back out without work, which makes it hard to burn a new image onto the cart, which is half the fun.

If you don't want to cut up the cart, you might try Mill-Max's Ultra Low Profile DIP sockets:

(huge search string)

They sit about 2mm high, giving you just about 2mm for the EPROM to sit on top of it. That might work, but I've never tried it. Mill-Max will be happy to send you a sample if you want to give it a shot.


Top
 Profile  
 
 Post subject:
PostPosted: Fri Sep 23, 2005 11:52 am 
Offline
User avatar

Joined: Fri Nov 12, 2004 2:49 pm
Posts: 7572
Location: Chexbres, VD, Switzerland
coinheaven wrote:
wow that is an awesome list.

Oh my god, it isn't. This list looks very unaccurate. This place seems better : http://www.parodius.com/~veilleux/boardtable.txt

_________________
Life is complex: it has both real and imaginary components.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 23 posts ]  Go to page 1, 2  Next

All times are UTC - 7 hours


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group