When you are in the "Download Folder" locate the7-zip file "NullDC_104_r136"
This is the nullDC emulator. Just double click on the file to open it (assuming that you have already have installed 7-zip program installed, if not please download a free copy here then install). Once you open "NullDC_104_r136" you will be brought to the 7-zip program window. Follow the step-by-step instructions indicated in the succeeding pictures.
Once you open the "NullDC_104_r136" 7zip file you will see two folders: "nullDC_104_r136" and "nullDC_NAOMI_104_r136". These are the emulators for the Dreamcast home console and Dreacast Arcade (NAOMI) respectively. The demo game we have downloaded is the home console version so we use the home version. Please select "nullDC_104_r136" and go to that folder.
Once we are in the "nullDC_104_r136" we select all the files and folders that is located in that "nullDC_104_r136" folder. You can easily do this by pressing "CTRL+A" to select all files and folders in the current active window. Click on the blue "-" sign located in the upper left. This will bring you to the "Copy to" window. Press the "three horizontal dots" to specify where the files should be located. I specified mine in my Desktop and named the folder "DC emulator nullDC."
After extracting the emulator bios files to our desired folder we go to that folder and open it. Upon opening we will focus our attention only to these to items: "Data folder" where we will install the Dreamcast Bios and the emulation program itself "nullDC_Win32_Release-NoTrace.exe" (you can also create a shortcut of the emulator for easy access).
The next step is to download the correct bios for the emulator. There are many bios available online but you have to get this specific bios that will run in this emulator. I have sorted and identified the proper bios just follow my instruction below. Here is the link for the "Dreamcast Bios" it is about 21 MB in size. Once downloaded go to the "download page" once again by pressing "CTRL+J"
Upon opening the "dreamcast-bios.zip" we will be presented with several folders and files. We just need to copy these files: "dc_boot.bin" and "dc_flash.bin" to the "Data folder" of the nullDC emulator. Select the two files to copy then press "CTRL+C" as shown in the picture above. This copies the files in your clipboard where you can paste it later. Go to the folder of the emulator as shown below.
After copying the Dreamcast bios in the clipboard we go to the proper directory where it should be pasted. This is located in the Emulator program folder of nullDC specifically in its "Data" folder.
To do this we will just press "CTRL+V" to paste the bios files in the "Data" folder of the nullDC emulator. After pressing CTRL+V you should see the files pasted in the said folder as shown above.
Done! we have successfully installed the proper bios for the emulator. If not there will be an error message. If there is we might not have copied all the files needed or used a wrong bios. Make sure that you have followed the instructions given above.
NullDC 1.0.4 r136 is a Dreamcast emulator that runs on Windows platform.
NullDC 1.0.4 r136 was developed by NullDC and you can run Dreamcast games with it.
The emulator's size is 0.9MB and you can download it by clicking the button below.