A usefull shortcut not highlighted in the article: Instead of implenting an emulator for the LCD display hardware, the author simply peaked at the frambuffer and dumped the contents.
For most target hardware, this shortcut provides a reasonable approximation of the intended output image. However, some older hardware relied upon specific characteristics of CRT displays to enhance the graphics. For example, some clever developers found that they could create extra colors by swapping the palate during the vertical blanking interval on interlaced NTSC video.
Of course, some of the earliest video game consoles don’t have a framebuffer since RAM was to expensive. For these consoles, you will be stuck writing a video display emulator.
For most target hardware, this shortcut provides a reasonable approximation of the intended output image. However, some older hardware relied upon specific characteristics of CRT displays to enhance the graphics. For example, some clever developers found that they could create extra colors by swapping the palate during the vertical blanking interval on interlaced NTSC video.
Of course, some of the earliest video game consoles don’t have a framebuffer since RAM was to expensive. For these consoles, you will be stuck writing a video display emulator.