6. Phase 6 – Maintenance of the system
- The maintenance of the ES involves is updating, charging in the system when
operating. When operating, more problems occur in the system, so it is necessary
to continue take care the system by expert in a fix period of time
- So expert system, are so complex that in a few year the maintenance costs will
equal the development costs.
BOOK II: Computer systems architecture.
Chapter 1 – 2: NUMBER BASES.
Question 1. Common number bases used in computer hardware operation?
• Decimal(denary) system:
- The base is ten – there are 10 different symbols, the digits 0, 1, 2, etc...upto 9
- To represent value less than ten involves only one digit larger values need two or
more digits
• Binary system
- The base must be two, with only the digits 0 and 1 available
- To show values of two or ever require two or more binary digits
• Octal system
- Octal system has eight as its base, it uses the symbol 0, 1, 2 up to 7 only
- Two or more digits are needed for values of eight and above
• Hexadecimal system(hex)
- Hexadecimal system has sixteen as its base, it use the symbols 0, 1, 2...,9 & A, B,
C, D, E, F, to stand for the “digits” ten, eleven, twelve, thirteen, fourteen, fifteen.
Question 2. Converting from Bases To Bases?
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