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Basic parts of a computer
ALU
Control Unit
Memory Unit
Input Unit
Output Unit
What is address bus?
Carry cpu generated signals outward to memory and i/o devices
- Unidirectional
- address lines determine the size of accessible memory space
What is data bus?
Data signals that travel in and out of a microp
- number of wires in the data bus correspond to word size that the microp operates with
-8086 has 16 bit data bus and 8088 has 8 bit data bus
-bidirectional
What is a control bus?
carry signals to and from the cpu and external devicesE.g. read, wait, ready, hold
Diagram of a bus structure?
Bus interface Unit components?
Segment registers
Instruction pointers
Address gen adder
Bus control logic
Instruction Queue
Components in EU?
Arithmetic Logic Unit
General purpose registers
Temporary operand registers
Status and control flags
Execution Unit registers
Accumulator Registers
Base registers
Counter register
Data Register
Base pointer register
Stack pointer register
Source index register
Destination Index register
FLAGS register
BIU registers?
Instruction pointer
Code segment
Data segment
Stack segment
Extra segment
How are the EU and BIU connected and how does it work?
Connected by an internal bus
Implement parallel processing, BIU fetches up to 6 bytes for 8086 and 4 bytes for 8088 and places them in instruction queue (instruction prefetch)
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