OCR AS Computing F451 - 2nd June 2014 Watch

TelephoneBox
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#101
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#101
(Original post by laarchie)
It was not too bad. Some of the questions were in past paper so quite happy with that. However the question about storing a number in two bytes i was clueless and the one on distributed systems. I also struggled in the CIR question

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Bold: ??? what question?! Don't scare me! Do you mean the 312 one?

I thought the CIR question was worth more marks than I anticipated. I tried to get 6 points down but not sure if all of them were valid enough to be put in the mark scheme.
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Shamzy25
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#102
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#102
Guys .. It was easy


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KieRigby
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#103
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#103
(Original post by Shamzy25)
Guys .. It was easy


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Yeah, it was alright, I wouldn't say it was easy, some people may have found it difficult, but it was certainly a fair paper
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Daniel2013
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#104
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#104
Will there be an unofficial mark scheme for this at some point?
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QUANTAM
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#105
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cdc3267
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#106
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#106
WHat area of the spec was CIR covered in? I dont recall ever hearing about that?

cheers
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KieRigby
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#107
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#107
(Original post by cdc3267)
WHat area of the spec was CIR covered in? I dont recall ever hearing about that?

cheers
This was in the hardware section
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akld212
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#108
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#108
(Original post by TelephoneBox)
Bold: ??? what question?! Don't scare me! Do you mean the 312 one?

I thought the CIR question was worth more marks than I anticipated. I tried to get 6 points down but not sure if all of them were valid enough to be put in the mark scheme.
did you get 10000000 for the first byte?
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cdc3267
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#109
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#109
(Original post by KieRigby)
This was in the hardware section
On the CPU? penny has just dropped what it is

cheers Kie
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Daniel2013
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#110
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#110
I got 100111000 for the binary. I omitted the zeros before the start.
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TelephoneBox
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#111
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(Original post by Daniel2013)
I got 100111000 for the binary. I omitted the zeros before the start.
Me too, wasn't sure if this was alright as everyone else seemed to have written it as 12 bits or 2 bytes, so glad someone else omitted the leading 0s.

(Original post by akld212)
did you get 10000000 for the first byte?
Not sure what you're referring to, sorry?
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callumryan
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#112
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#112
I didn't omit the leading zeros as they haven't done it in the past with single byte questions. Probably 1 mark for each byte I'd imagine
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guge999
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#113
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Am I right in thinking it said describe how 312 could be represented in binary? I'm not sure you'd even need to give the binary value.
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Nick_888
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#114
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#114
What did you put down for the forms of validation on the price of a product?
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guge999
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#115
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#115
Format check and range check I think

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KieRigby
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#116
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(Original post by Daniel2013)
I got 100111000 for the binary. I omitted the zeros before the start.
I hate to break it to you but omitting the 0s is a bad idea, may have lost you a mark as it did specify a 2 byte binary number. Just like if it specified 8 bit binary number you would need all 8 bits regardless of whether they contribute to the value of the number.
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KieRigby
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#117
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(Original post by Nick_888)
What did you put down for the forms of validation on the price of a product?
I think I put down type check and presence check... What did you put?
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Nick_888
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#118
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#118
(Original post by KieRigby)
I think I put down type check and presence check... What did you put?
existence and check digit :confused:
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Ledhead27
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#119
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Thought the paper was OK, made some very stupid errors such as getting confused between serial and simplex.

The questions that really caught me out was the 312 tins of beans (I ended up putting 0100111000) and the CIR (did you gain a mark for putting Current Instruction Register I can't remember now :mad: and thought the number of marks available was too high in comparison to what could be said).

Some nice questions such as the validation, verification, packet switching, SLC and menu-based interface questions but there were some unusually worded ones too. Out of interest what did anyone put for the Network Operating System question.
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A_Leveler
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#120
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Yeah ^ what did people put for the network operating system question? Very last Q. in the paper...
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