In SX Microcontrollers, SX/B Compiler and SX-Key Tool, capdiamont wrote:

1) don't know about using a proto board but NTSC out has been done before http://www.hittconsulting.com/sxvideomodule.htm is bean's work. Forum Moderator here.

2) I don't think you can have program that run from external memory. You can store data in external memory, leaving more space for program.

3) bean's video also does sound, also see http://www.parallax.com/ProductInfo/Microcontrollers/SXDevelopersProjects/tabid/395/Default.aspx

4) anytime you need more accurate timing. Serial communications, such as talking to a PC need a resonator. I think video out will require a resonator. Also the internal timing will only do a max of 4mhz. If you need something faster, you need some sort of external timing such as a  resonator.

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