Programmable Read Only Memory (PROM) is a type of non-volatile memory used in computers and other electronic devices. It is a semiconductor-based integrated circuit that can be programmed once with data or instructions, but cannot be changed or erased afterward.
PROM contains a grid of cells, where each cell represents a bit of data. These cells are made up of transistors and diodes that form a logic circuit. By applying an electric charge or current to a specific cell, it can be programmed to store a binary value of either 0 or 1.
The programming process of PROM involves a special device called a PROM programmer, which is used to selectively burn fuses or disable particular cells in the memory grid. Once programmed, the data remains stored permanently, even when the power supply is turned off.
Unlike other types of memory, PROM cannot be modified or rewritten after it has been programmed. This makes it ideal for applications that require permanently storing data or instructions, such as firmware or microcode. However, the inability to alter the contents of PROM can also be a limitation, as any errors or changes in the programming would require replacing the entire chip.
PROM is commonly used in embedded systems, aerospace applications, industrial control systems, and other specialized electronic devices requiring non-volatile memory.
