Computer Architecture
 Computer Organization
 oComputer Architecture
 oAttributes of a system visible to the programmer
 oHave a direct impact on the logical execution of a program
 oArchitectural attributes include:
 oInstruction set, number of bits used to represent various data 
types,   I/O mechanisms, techniques for addressing memory
 oComputer Organization 
oThe operational units and their interconnections that realize the 
architectural specifications
 oOrganizational attributes include:
 oHardware details transparent to the programmer, control signals, 
interfaces between the computer and peripherals, memory 
technology used
+ IBM System
 ?A control unit manages the computer's resources and 
orchestrates(coordinate) the performance of its functional parts 
in response to instructions
Structure
+
 There are four 
main structural 
components
 of the computer:
 ?New models are introduced with improved technology, but retain the 
same architecture so that the customer's software investment is 
protected
 ?CPU - controls the operation of 
the computer and performs its 
data processing functions 
?System Interconnection - some 
mechanism that provides for 
communication among CPU, 
main memory, and I/OIBM System/370 architecture
 ?Included a number of models
 ?Hierarchical system
 ?