What is an interrupt number?What is AX register?

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Hi, I want to know what is meant by an interrupt number and AX register in a program that invokes mouse pointer

Posted 29-Jan-12 5:02am

Member 8320864

Updated 30-Jan-12 0:21am

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Sergey Alexandrovich Kryukov 29-Jan-12 14:45pm

What are you trying to achieve? What is "a mouse program". Do you need to write a device driver? Would need some more serious knowledge.
--SA

Richard MacCutchan 30-Jan-12 6:40am

What do you mean "a program that invokes mouse pointer"?

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Richard MacCutchan · Accepted Answer · 2012-01-29T05:13:00

Solution 1

Interrupt numbers are used by the hardware to signal the operating system when some external event occurs. The AX register is merely a general purpose register used by the CPU. Neither of them are specific to a mouse program (whatever that may be).
Take a look here[^] for some information on how processors work.

Posted 29-Jan-12 5:13am

Richard MacCutchan

Comments

Sergey Alexandrovich Kryukov 29-Jan-12 14:44pm

Correct, a 5. After all, the whole question is pretty much useless.
--SA

Richard MacCutchan 30-Jan-12 5:41am

Thank you. As you say another question where we get only part of the story.

[no name] 30-Jan-12 7:28am

Just wanted to add a little more history behind the AX register.

In the old days... dinosaurs programming on 8 bit processors used the A register... with A meaning Accumulator.
Then 16 bit processors were created... the A register was eXtended... and named AX.
Then 32 bit processors were created and we had to Extend the A register that was already eXtended and named EAX.

And then the 64 bit processor was created and... I have no idea why they called it RAX...

Richard MacCutchan 30-Jan-12 7:31am

8-bit processors ... now they were fun.