You are right that with SGC, you control the display with a serial port (PIC, PC or any other serial source). To get a complete list of SGC commands, download the 116-page manual here http://www.4dsystems.com.au/download...S-SIS-rev6.pdf
Note that no matter which version you get (SGC or GFX), you can switch from one mode to the other by changing the PmmC file. At any time, you can reload the PICASO chip with either PmmC which allows you to explore the differences between the two configurations.
For example, to display a video stored on the SD card, you send a series of bytes to the display as in the example below.
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