A convenient means of controlling variable speed motors. The sequence of binary instructions that tell the CPU what to do. R RAM Random Access Memory. A memory that stores data and instruction in static or dynamic cells. Contents can be read and written freely.
Static RAMs can be faster and require only that power be applied to maintain the memory contents.
Dynamic RAMs require additional refresh circuitry that provides an electrical refresh pulse on a regular basis. ROM Read Only Memory. A memory that stores data and instructions permanently. Contents are placed into memory at the time of manufacture and cannot be altered. Widely used in microcontroller applications.