Saturday, October 18, 2008

Computer Evolution and Performance Part 3


IAS

  • 1946, with the computer stored-program concept publised.
  • Known by the name Computer IAS (Computer of the Institute for Advanced Studies).

IAS structure
Here is the structure of the computer IAS:
  • Main memory, to store data and instructions.
  • Arithmetic Logic Unit (pestle), for binary data.
  • Control Unit, to control the instructions in memory.
  • I / O, to interact with the environment outside.

Structure computer IAS


IAS - details

>> Memory IAS consists of 1,000 storage locations called the word.
  • - Word consists of 40 bits.
  • Data and Instructions in a code in binary.
  • One word consists of 20 bit instructions, each - each 8 bit code operation (op code) and 12-bit address.
>> Set of Registers (storage in the CPU)
  • Memory Buffer Register (MBR), contains one word, stored in memory or used to receive word from memory.
  • Memory Address Register (MAR), to define the word address in memory to be written or read from the MBR by the MBR.
  • Instruction Register (IR) port, 8 instruction beet contains code that the operation will be executed.
  • Instruction Buffer Register (Heb), used to store instructions while the right word in memory.
  • Program Counter (PC), contains the address of the next pair of instructions will be retrieved from memory.
  • Accumulator (AC) and the multiplier quotient (MQ), used for temporary storage operand and the results pestle.
>> IAS operate repeatedly, forming cycle instructions.
  • Computers IAS has 21 instructions, which are grouped as follows:
  • Data transfer, transfer of data between memory with the register - register pestle or between two registers pestle own.
  • Unconditional branch, the command - the command execution without branching certain requirements.
  • Conditional branch, the execution branching certain requirements that need to produce a value of these ramification.
  • Arithmetic, the operation - operations which was formed by the pestle.
  • Modify Address, the instructions - instructions that allows changing the address on the so Computational address that allows high flexibility in programs.

Struktur IAS Detail


IAS Image

0 comments: