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.
- 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.
- 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
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