What is difference between relative file and indexed sequential file?

Relative:-

1. In this mode the content of the program counter is added to the address part of the instruction to obtain the effective addressed.

2. Effective Address = Contents of the program counter + contents of address field.

3. No extra index bit is used.

4. Example:-

EA = [ BX ] + [ SI ] + disp.

EA = [ BX ] + [ DI ] + disp.

Indexed:- 1. In this mode of addressing an attempt is made to avoid the use of two addressed for an operand.

2. Effective Address = Address field + contents of the specified

• index registers.

3. In this extra index bit is used.

4. Example:-

EA = [ BX ] + [ SI ]

EA = [ BX ] + [ DI ]