Crossword Genius

Chap gets round a computer memorys limiting factor (9)

Ross

I believe the answer is:

parameter

I'm a little stuck... Click here to teach me more about this clue!

'limiting factor' is the definition.
(I've seen this before)

'chap gets round a computer memorys' is the wordplay.
I cannot quite see how this works, but
'chap' could be 'ram' and 'ram' is present in the answer.
'a' is present in the answer.
The remaining letters 'peter' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for parameter that I've seen before include "Quantifiable characteristic of a system" , "Variable amount" , "One of a set of factors as conditions for operation of a system" , "Limiting factor" , "Limitation" .)

I've seen this clue in The Daily Mail.
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