This is an awesome program! I know i'm way late to the party, but Was 9999in1 ever upgraded to UNROM or anything else?

HAHA THATS WHAT BLACK PEOPLE SAY

I always wanted to make my own 9999 copies of broken Super Mario cartridge!

oh my, LOL.

PIMP MY ROM™ - New and improved.

"Fo shizzle!!"
That's hilarious.

Made some changes to the source code.. and title screen, as you can see above. Will add UNROM, MMC1, and MMC3 soon enough.

I love raining on No Carrier's parade. The cleansing rain of GOD'S LOVE.

Yeah, I've seen that before. Totally cool. However, you're right - open source is the bomb. My goal isn't to have the best multicart program, but to have one that can teach people how to do stuff on their own. Another good one is the Forbidden Four - and it does come with source code: http://wiki.nesdev.com/w/index.php/Forbidden_Four

woooooooooooooooooaaaaahhhhhhhhhhhwwwwwww!!!1

alright now i need 4 progressively more hardcore versions of bubble bath babes

Not to rain on No Carrier's parade here, but I found this a while back and it's pretty awesome:

http://ninjagaiden4.thegaminguniverse.c … ebrew.html

The 11-in-1 Multicart ROM. It's for MMC1, or more specifically, the SUROM board. Put 11 NROM roms into the Windows executable, get one MMC1 ROM out.

Still, open source is the bomb, and the 9999 is indeed open source. With some tweaking this could become even moar awesome!

EDIT: I did some digging for mapper 66 donor boards. There appears to be only one available in the US, and that's Gumshoe.

wow! thanx!

9999-in-1 uses mapper 66, which is most common as a GNROM board, or the game Gumshoe in the US. I chose it because it is prone to bus conflicts, like UNROM and other "discrete logic" mappers. There is no mapper chip per se, but GNROM uses a 74HC161 as a 4-bit register to swap between banks. Mapper 2 / UNROM may have been a better choice for this, as its more common, but I chose GNROM since it seems better suited for a multicart. The good thing is, once you understand how to avoid bus conflicts and swap with RAM code, you can apply this code to any discrete logic mappers.

OK, you got it. Great idea considering the carts are available at RetroZone here: http://www.retrousb.com/product_info.ph … ucts_id=43

nitro2k01: MMC1 carts are more available, as you see above. However, they actually use a dedicated mapper chip to bank switch, rather than just something like a 74HC161.

NO CARRIER: Hmm, so there are NES mappers like that... I guess I should rephrase my question: 999-IN-1 apparently doesn't support just any mapper, right? (Unless the NSF format is constructed to normally reside in a non-fixed bank on mappers that have fixed banks?) How difficult is it to find a suitable donor cart that is theoretically compatible? (Because that's how you do it right? Donor cart+EEPROM socket...)

And yes, I understand the concept of copying code to RAM. I've made a whole little "framework", if you could call it that, for Gameboy to allow code execution in RAM. (Framework=Useful routines and macros to realign jumps and loads, and a simple specification for a general purpose loader.) This is useful for two things: 1) Code that modifies flash memory on supported cartridges. (Such as my LittleFM.) 2) Allows code to be loaded into RAM, after which you can remove the cartridge and have the program keep running. The latter is only really stable on GBC.