MEGALAPAK Modern controllers usually require three connections - one to the power terminal of the driver's station (customarily white), one to the brake terminal (red), and one to the track terminal (black). They usually have 10 mounting holes with American 6-32 UNC 2B threads: three on each side and four on the bottom. In contrast, serial access memory (SAM) stores data as a series of memory cells that can only be accessed sequentially (like a cassette tape). SAM works very well for memory buffers, where the data is normally stored in the order in which it will be used (for instance, the texture buffer memory on a video card).|Samsung Galaxy A23