AIX AND P-SERIES INTRODUCTION.

 classification of computers based on the number of instructions that can be executed.are:-

1. Complex instruction set computers (CISC)

                                         2. Reduced Instruction set computers (RISC)

Comparison  RISC VS CISC( which is best)

the Performance Equation
 a computer's performance ability is calculated by following equation:

The CISC  tries to minimize the number of instructions per program, sacrificing the number of cycles per instruction.

                                        RISC does the opposite, it reduces the cycles per instruction at the cost of the number of instructions per program.

RISC system has fewer instructions and are faster and reliable.

IBM has the following series of systems

x series – intel based systems

z series – Mainframe systems

i series – AS/400 systems

p series – RISC systems

IBM introduced RISC System (RS/6000) in 1986. 

Performance Optimized With Enhanced Risc (POWER) system was introduced in 1990. 

Which was the starting of the pseries.

Power 2 was introduced in 1993 

                                        power 3 in 1999. 

                           power 4 in 2000

Power 5 : p510,p520,p550,p570, p575, p590, p595