AS Computer Science AQA Paper 2 14th June 2016

I couldn't find a thread for the Paper 2, so I thought I'd make one.

How's everyone's revision going?
Feel free to share resources :smile:

(edited 7 years ago)

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How did everyone find that paper?
I didn't like the Boolean algebra and the assembly language questions :frown:

Reply 3

OturuDansay

Original post by swingrx

How did everyone find that paper?
I didn't like the Boolean algebra and the assembly language questions :frown:

A lot easier than the programming paper lol and yeah the assembly language Q's were a bit tricky.

Reply 4

Valantina.R

Original post by swingrx

How did everyone find that paper?
I didn't like the Boolean algebra and the assembly language questions :frown:

Yeah I didn't like that one either what did you end up writing for it though?

Reply 5

MrCoolVille

What did you get for the Boolean algebra answer? I got A.B or A+B!

Reply 6

swingrx

Original post by MrCoolVille

What did you get for the Boolean algebra answer? I got A.B or A+B!

I got Not A and Not BBut apparently the right answer was Not A and B :/

Reply 7

MrCoolVille

I got Close :smile:

Anyways how did you do the assembly code question?

Reply 8

swingrx

Original post by MrCoolVille

I got Close :smile:

Anyways how did you do the assembly code question?

AND R3 R1, #1
BNQ endif1:
STR R2, #69
endif1
BEQ endif2
STR R2, #Y
endif2
HALT
I think thats what I wrote, I'm not write if it's right though...

Reply 9

Djebar

What did people get for the first assembly question? The 1 mark one. I got #128 because it asked for the last bit but everyone I talked to go #1 or #0.

Reply 10

MrCoolVille

Original post by Djebar

What did people get for the first assembly question? The 1 mark one. I got #128 because it asked for the last bit but everyone I talked to go #1 or #0.

I got #1 too.

Reply 11

MrCoolVille

What did people write for simp lying the two Boolean statements. The first one was not C but what was the second one?

Reply 12

OturuDansay

Original post by Djebar

What did people get for the first assembly question? The 1 mark one. I got #128 because it asked for the last bit but everyone I talked to go #1 or #0.

I wasn't sure, I put 0 tho

Reply 13

Bradley99

Haha I got B on the boolean algebra question

Reply 14

ShatnersBassoon

For the assembly question, I put "Machine code" for the 1 marker and my assembly code was something like:

AND R3, R1, #1
CMP R3, #1
BEQ odd:
BNE even:
odd STORE* R2, 79
even STORE* R2, 69
HALT

*Not its exact name - can't remember now what it was called.

I imagine most people did it the other way around ("CMP R3, #0; BEQ even:" etc.)

I got (not A).B for the Boolean logic.

For the pixel image I got 64 bytes (16*16*2/8), but said that the actual file would be larger because computers use 8-bit numbers for each pixel.

The networking stuff was terrible - what was the device you needed to name in the first part and why couldn't the student access the network?

I also had no clue as to the components of an SSD drive.

Reply 15

Bradley99

Original post by MrCoolVille

What did people write for simp lying the two Boolean statements. The first one was not C but what was the second one?

I got just C for the second one.

Reply 16

Bradley99

Original post by ShatnersBassoon

I got 64 bytes for the image
It was a networking card i think and by using SSID whitelisting.
And floating gate transistor / NAND flash memory chips.

Reply 17

ShatnersBassoon

For the three methods of improving processor speed:

Word length: more words means more data can be processed at once.
Clock speed: the faster the clock speed, the more instructions can be processed per second.
Bus width: a wider data bus means more data can be transmitted at once.

I'm pretty sure I got the three methods right but I'm not sure my explanations of their effects were sufficient enough to get the other 3 marks.

(-9)^2 was a natural number; sqrt(2) was irrational; -4 was an integer but not natural.
For the binary stuff I remember 39 (in hex), 57 (in decimal), the character "9" and 3.5625.

Original post by Bradley99

It was a networking card i think and by using SSID whitelisting.
And floating gate transistor / NAND flash memory chips.

I can say for a fact that our teachers have never mentioned NAND flash memory chips or floating gate transistors. Thanks for the answer tho - I'm blaming my teachers if I've done badly.

(edited 7 years ago)

Reply 18

swingrx

Original post by MrCoolVille

What did people write for simp lying the two Boolean statements. The first one was not C but what was the second one?

I got C

Reply 19

Bradley99

Original post by ShatnersBassoon

For the three methods of improving processor speed:

Word length: more words means more data can be processed at once.
Clock speed: the faster the clock speed, the more instructions can be processed per second.
Bus width: a wider data bus means more data can be transmitted at once.

I'm pretty sure I got the three methods right but I'm not sure my explanations of their effects were sufficient enough to get the other 3 marks.

I can say for a fact that our teachers have never mentioned NAND flash memory chips or floating gate transistors. Thanks for the answer tho - I'm blaming my teachers if I've done badly.

Yeah for the 3 I put wider data bus, wider address bus, higher clock speed.

My teacher only went through SSD's today so I was lucky. The paper was okay, there were just some bad questions.