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37 Cards in this Set
- Front
- Back
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What are the 4 components in the 3 box model?
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Processor, main memory, I/O and Bus
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Data bus
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bi directional
32 wires 3 box model |
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Address bus
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unidirectional
32 wires addresses memory and I/O locations |
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Control bus
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bi directional
8 wires transports control signals |
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Clock signal
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timing
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Reset signal
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initialises components
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Memory read
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Asserts that memory location currently in use is being read from
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I/O
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indicates that processor wishes to use an I/O controller
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Name all parts of extended 3-box model
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Processor, Main memory, Keyboard input controller, Keyboard, VDU output controller, VDU, I/O controller, Secondary store, buses
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Name 2 components in Von Neumann architecture
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Processor, Main Memory
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What is Harvard architecture
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When a computer uses separate instruction and data buses
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Name the 3 components in Harvard architecture
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Instruction Memory
Processor Data Memory |
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What dies the stored program concept state?
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That a program must be present in main memory to be executed
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Name all parts of a processor
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ALU (Arithmetic & Logic Circuits)
Control Unit Instruction Decoder Registers, Internal Clock, |
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What does the ALU do?
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Performs arithmetic and logical operation (add, subtract)
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What does the program counter (PC) do?
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points to next instruction to be fetched and executed
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What does the SP (stack counter) do?
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points to a stack holding return addresses
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What does the status register do?
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hold condition code to indicate the outcome of operations
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What does the accumulator do?
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Holds result of current calculation
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What does the CIR do?
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Holds current instruction to be executed
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What does MAR do?
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Holds address of current memory location
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What does MBR do?
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holds data item being t
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What is op-code
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denotes basic machine code operation
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What is the operand
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Denotes the address of binary data
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What is a library program?
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A collection of compiled routines other programs can use
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What is an assembler?
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A program that translates assembly code into machine code
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What is a compiler?
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High level -->object code
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What is an interpreter?
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Analyses and executes each line of a high level language
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A.A
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A
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A.!A
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0
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1+A
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1
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0+A
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A
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A+A
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A
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A+A
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A
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A+!A
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1
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0.A
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0
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1.A
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A
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