NES game save system

Nes Man · Post by **Nes Man** » Wed Dec 22, 2004 8:10 am

Why can't you just have a memory card that record the state of the cpu like directly from cpu. like replacing cpu's one with a copied state?

Post by **Sparkfist** » Wed Dec 22, 2004 8:29 am

He talked about that, if you do that when you start the game back up the CPU will not know what operations it was in the middle of, going to recieve and what it had just done.

JackFrost22 · Post by **JackFrost22** » Wed Dec 22, 2004 4:57 pm

what about taking the cpu off the game and onto a built in program

Post by **gannon** » Fri Dec 31, 2004 1:38 am

Here is the email of someone who can help with this. BTTDgroup@hotmail.com
Their is an input on the nes' expansion port that actually will freeze the cpu and ppu with their current code. He used that fact to be able to freeze games that you can't normally pause, but I think it'd easily be implemented in reading the state of the chips.

Dark Savant0 · Post by **Dark Savant0** » Fri Dec 31, 2004 11:35 am

Isnt this like the save game state on the Gameshark for GBC or GBA?

MM007 · Post by **MM007** » Fri Dec 31, 2004 1:41 pm

gannon wrote:Here is the email of someone who can help with this. BTTDgroup@hotmail.com
Their is an input on the nes' expansion port that actually will freeze the cpu and ppu with their current code. He used that fact to be able to freeze games that you can't normally pause, but I think it'd easily be implemented in reading the state of the chips.

Hmmm....can it also be used to SET the moe of the chips?

Edit: I tried to send the e-mail and it said the e-mail account didn't exist.

Epicenter · Post by **Epicenter** » Sat Jan 01, 2005 4:33 am

JackFrost22 wrote:what about taking the cpu off the game and onto a built in program

That doesn't make any sense at all. Please elaborate when you post, it's extremely difficult to tell what you're trying to say at any given time. At least use punctuation ..

JackFrost22 · Post by **JackFrost22** » Sat Jan 01, 2005 8:33 am

having the cpu do something else instead of the game you are trying to save

someone · Post by **someone** » Sat Jan 01, 2005 10:55 am

he means to have the CPU be interuppted to pause running the game to run the game-saving program.

HK-47 · Post by **HK-47** » Sat Jan 01, 2005 11:55 am

Freezer cartridges allow the running program to be stopped, so that memory images can be backed up, modified or restored.

sleeky · Post by **sleeky** » Sat Jan 01, 2005 4:06 pm

I wonder how this device worked then?

http://www.atarihq.com/tsr/odd/scans/gar.html

Lee.

someone · Post by **someone** » Sat Jan 01, 2005 8:51 pm

i dun know!

Post by **gannon** » Sat Jan 01, 2005 9:03 pm

I think that was talked about, and it was said to barely ever work right.

someone · Post by **someone** » Sat Jan 01, 2005 9:14 pm

maybe they messed up the decimel on the 95% compatability and ment 9.5%

HK-47 · Post by **HK-47** » Sat Jan 01, 2005 9:56 pm

^True. That is a crappy pic...
Edit theyy work by loading the game into ram then fiddling with the games code. Something like that.