Within each content area, there are one or more tutorials. Each tutorial consists of lessons. Each lesson should be a page detailing the concept being taught, along with sample code. Lesson and page ...

U21 Xilinx CPLD Replacement The U21 chip, a Xilinx CPLD, controls mainly sync signals that's output to the VGA output. There seems to be a few situations wit this chip. Some arcade boards come with a ...