AQA COMP2 7th June 2011 AM

I'm fairly sure payroll is bespoke.

Memory Address Register is right.
Think the second one is Current Instruction Register.

Yep 2nd gen. Yeah I put 'address' hopefully that should be enough. Opcode and Operand are right. I'm not sure what 1 to 1 mapping is? I just put they were the same!

No problem

F*ck, payroll is bespoke.

Just lost a mark there

What do you think the grade boundaries will be?

45 for an A is my best guess.

What did people put for that question about what a 64 bit system that uses an address bus meant? (Sorry, can't really remember the exact question)

I put 'The computer can store 2^64 different address buses'.

What did people put for the question where you had to match each peripheral to the correct memory sizes?
Especially the one that had 512MB to 128GB?

I put Magnetic Hard Disk for the one that went up to 2 TB
I put USB Flash Drive for the one that went from 512MB to 128GB
I put Bluray Disc for the one that went from 4.7GB to 8 GB
I put CD-Rom for the one that went from 600MB to 700MB

Who agrees with me on this one?

What did people for the question about why a software is bought on CD rather than bought.
I put 'Software bought on CD is portable and can be used again and again. It can also save Hard Disc Space. Whereas software that is downloaded takes up more memory space and takes longer to obtain software'.

i would say payroll was special purpose. it MIGHT also be bespoke, depends how generous they are. payroll is just people, hours and rates, you don't need to rewrite the whole thing for different companies. you just fill in different people, hours and rates.

was it flight sim or auto pilot type software because to my mind THAT's the bespoke one.

i agree with MAR and MBR for the registers mentioned. i agree with the address, opcode, operand and 1 to 1 mapping.

Same as that.



4.7GB to 8GB is DVD because you can get minimum 4.7GB DVD's and 9.xGB DVD's which are dual layer. Blu-ray is higher.

Sorry, I didn't remember there being an option for DVD

Correct, Payroll is special purpose and Air Traffic thing is Bespoke, as stated in the textbook.

It was DVD+R I think.

What did people put for that question about why a DVD+R can hold more data than a CD, even though they are of the same weight and dimension?

I put DVD+R has a dual layer whereas a CD has a single layer.
Does anyone agree with me?

Also, does anyone know if this is accecptable for the boolean algebra, I put the NOT gate after the AND.

Also, does anyone know if this is accecptable for the boolean algebra, I put the NOT gate after the AND.

Sorry, I didn't remember there being an option for DVD

It was DVD+R I think.

To Be Honest, I am not sure.

I intially drew the same diagram as you did, but then changed it when going through the paper again.
I changed it because if I had put the 'AND GATE' and the 'NOT GATE' like you have, the output would have been http://ptgmedia.pearsoncmg.com/images/chap2_9780137045792/elementLinks/ab-bar.jpg (image taken from Google images) and not http://ptgmedia.pearsoncmg.com/images/chap2_9780137045792/elementLinks/a-bar-b-bar.jpg (image taken from Google images).

I think it was data bus. Its annoying when you write the right answer then cross it out to put another one Which turns out to be wrong

I am sure that the bus is the control bus as it is two-way everywhere. The data bus is one-way when comes from the keyboard controller and goes into the VDU controller.