I have been encountering this problem ever since I download NullDC. I can set up two controllers just fine, but when trying to play games it never works. It will either register both controllers as controller 1, or only register the controller set up on Controller 1 as Controller 1, and it will not register on Controller 2 as Controller 2. A few months ago, I believe I was able to get it to work by emulating one controller as keyboard using Xpadder, and setting up the other as a Controller in NullDC. Since, I have not been able to duplicate that. It clearly supports up to 4 controllers, or else there would not be options for it - at least, if I were to make an emulator for a system that supported a certain amount of controllers, but not all of them worked, I would restrict it to only the number that worked, that's just me though. Anyway, this is really getting on my nerves, does anyone know how to fix this? Next thing I am going to try is to set up both controllers to emulate the keyboard, there is enough buttons to accommodate two, so...
Another problem I have been experiencing is that only Controller 1 will stay plugged in when I exit NullDC. I can have all 4 controllers set up with PuruPuru, but then exit NullDC, run it again and only Controller 1 is set up. This is extremely aggravating, especially when sometimes I go to set up a VMU on one controller, NullDC will crash and I will have to do it all over again.

NullDC is an open source Dreamcast and Naomi emulator started by drkIIRaziel. It was pretty much dropped by its author for awhile until he dumped the source code, a few other internet heroes came in to work on it and then he jumped back in as well. Downloads 1 Downloads 2 Guides and Info 3. NullDC is a freeware Sega Dreamcast and NAOMI, the arcade version of the hardware developed by Sega. It is developed for the Windows platform.

Emulators » Sega Dreamcast » Windows » nullDC

DC Emulator for Windows

Overview

nullDC is an open source Sega Dreamcast and NAOMI emulator for Windows, developed by drk||Raziel (currently under the nickname skmp) and ZeZu. It was released under the MIT license. nullDC requires DirectX 9.0c, Visual C++ runtime libraries and optionally WinPcap for modem emulation. BIOS files are also needed. It has a plugin architecture, with several alternative implementations (some ported from Chankast) for graphics, sound, reading games burned to CD-ROMs (it cannot read GD-ROMs directly) or disk image files, memory cards, etc.

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Other systems supported by nullDC:

Sega NAOMI

Download

Download NullDC 1.0.4 (June 20 2010) (2027.53K)

Nulldc Bios Download

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Alternate versions and additional files

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Nulldc Emulator With Bios And Plugins

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