IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Miscellaneous => Topic started by: Dasith on April 29, 2011, 12:44:11 am

Title: Computing
Post by: Dasith on April 29, 2011, 12:44:11 am

What Does an Index register do in the processor, what exactly does it hold, & what is the function of it?

My text book dosn't  give anything about the index register, but i saw it in a past paper ,please help me by answering the question as soon as possible....

Title: Re: Computing
Post by: rickyponting66 on April 19, 2012, 08:23:31 pm

I am new to computing, can I ask which text book you were consulting, I am having problems with computing.

Sorry for going off-topic on this thread.

Title: Re: Computing
Post by: username on April 20, 2012, 08:56:23 am

An index register is a microprocessor register used for modifying operand addresses during the run of a program, typically for doing vector/array operations. Index registers are used for a special kind of indirect addressing where an immediate constant (i.e. which is part of the instruction itself) is added to the contents of the index register to form the address to the actual operand or data.

hope this helps :D
cheers m8