National 5 Computing Science - Memory
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The document discusses Von Neumann architecture and main memory. Main memory consists of storage locations identified by unique addresses. Each location holds one word of data that a CPU can process in a single operation, such as 8 bits for an 8-bit computer. There are two types of main memory: random access memory (RAM), which temporarily stores running programs and data, and read only memory (ROM), which permanently stores basic instructions for starting the computer.
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National 5 Computing Science - Memory
- 3. Main Memory Main memory (primary memory) is held on chips Backing storage is not main memory Backing storage is sometimes called secondary memory
- 4. Main Memory Main Memory 11110011 11110011 Address 00000000 00000001 00000010 00000011 00000100 00000101 00000110 00000111 00001000 00001001 Main memory consists of storage locations which are identified by unique addresses
- 5. Main Memory Main Memory 11110011 11110011 Address 00000000 00000001 00000010 00000011 00000100 00000101 00000110 00000111 00001000 00001001 Main memory consists of storage locations which are identified by unique addresses Each storage location holds one word (the number of bits the CPU can process in a single operation) • 8 bit computer holds 8 bits in a storage location • 16 bit computer holds 16 bits in a storage location
- 6. Main Memory Main Memory 11110011 11110011 Address 00000000 00000001 00000010 00000011 00000100 00000101 00000110 00000111 00001000 00001001 Main memory consists of storage locations which are identified by unique addresses Each storage location holds one word (the number of bits the CPU can process in a single operation) • 8 bit computer holds 8 bits in a storage location • 16 bit computer holds 16 bits in a storage location There are two types of main memory: •Random Access Memory (RAM) •Read Only Memory (ROM)
- 7. Random Access Memory RAM •When a program is loaded from disk its instructions are stored in the computer’s RAM •RAM also stores the program data e.g. Word document, email •Can hold the operating system •All data is lost when the computer is switched off - volatile
- 8. Read Only Memory ROM •Has contents which are fixed when the chip is manufactured – cannot be changed or written to •Holds the bootstrap loader part of the operating system •Retains its data when the computer is switched off – non-volatile