For 6630 I suggest you download and install version 1.16b of my emulator (Latok already gave the link). After installing, the emulator should appear under "Games" folder on your phone. Before you can play any games with it, you need to copy the MSX system ROMs and the games you want to play to the phone. Here's how to do it (you can also do this over Bluetooth if you don't have the USB cable for your phone):
1. Make sure you have Nokia PC Suite software installed on your PC. If you don't have it yet, download it from Nokia website.
2. Connect your phone to a PC with Nokia's USB cable. You should see a bubble from the PC Suite on Windows desktop saying your phone is connected.
3. On the PC, open "My Computer" and from there, navigate to "Nokia Phone Browser", open it and then double click your phone.
4. Now you should have at least "Phone memory (C

" as an option. If you have a memory card on your phone, you should also see "Memory Card: (E

". You can choose either one, just remember to set the corresponding setting in the emulator.
5a. If you choose phone memory, open it, and from there go to "Nokia" and "Games".
5b. If you choose memory card, open it, and from there go to "Games".
6. If you don't see a folder called "fmsx", create it. Open the "fmsx" folder.
7. This is the folder where you need to copy all your game files (i.e. .ROM/DSK/CAS files). But first create yet another folder here called "systemrom" and open it.
8. This is the folder where you need to copy the MSX system ROM files (see my web page for instructions on what files you need and how to name them).
9. When the system ROM files are in place and you have copied some game files to the phone as well, launch the emulator and start playing
If you need further instructions with some of the steps above just ask.