Re: [discussion_vu] CS401 Paper 30-11-2011

Thanks Umer

On Wed, Nov 30, 2011 at 8:45 PM, سیٌد عمر شاہ <mubarakanwer@gmail.com> wrote:

Assalamu Alaykum Warahmatullahi WaBarakatuhu,

 

What is the syntax of PUSH instruction?  2 Marks

 

For what purpose DS and ES registers are generally used in the context of video memory. 2 Marks 

 

When the instructions "push ax" is executed in decrementing stack how the value of SP will change. 3 Marks

 

What colors are repeated by 0th, 1st and 2nd bits (from least significant side) in Attribute Byte? 3 Marks

 

How SCAS instructions can be used to detect Null at the end of a string?

5 Marks

 

What is the wrong with this program? 5 Marks

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