K7. Examples of CISC processors are Intel & , Pentium, Pentium II and III, and Motorola 68000. . Memory Devices A memory is just like a human brain.
It is used to store data and instructions. Computer memory is the storage space in the computer, where data and instructions are stored. There are two types of accessing methods to access (read or write) the memory. They are sequential access and random access.
In sequential access, the memory is accessed in an technology they use to hold data. Dynamic RAM being a common type needs to be refreshed frequently. Static RAM needs to be refreshed less often, which makes it faster. Hence, Static RAM is more expensive than Dynamic RAM.
. . Read Only Memory (ROM) Read Only Memory refers to special memory in a computer with pre-recorded data at manufacturing time which cannot be modified. The stored programs that start the computer and perform diagnostics are available in ROMs.
ROM stores critical programs such as the program that boots the computer. Once the data has been written onto a ROM chip, it cannot be modified or removed and can only be read. ROM retains its contents even when the computer is turned off. So, ROM is called as a non-volatile memory.
. . .1Programmable Read Only Memory (PROM) Programmable read only memory is also a non-volatile memory on which data can be written only once. Once a program has been written onto a PROM, it remains there forever.
Unlike the main memory, PROMs retain their contents even when the computer is turned off. The PROM differs from ROM. PROM is manufactured as a blank memory, whereas a ROM is programmed during the manufacturing process itself. PROM programmer or a PROM burner is used to write data to a PROM chip.
The process of programming a PROM is called burning the PROM. . . .
Erasable Programmable Read Only Memory (EPROM) Erasable Programmable Read Only Memory is a special type of memory which orderly manner from starting to end. But, in random access, any byte of memory can be accessed directly without navigating through