Invisible wrote:

> - Board B has less writing printed on it between the two RAM chips. The 
> actual components mounted there appear identical, but just fewer markings.

Wrong. Actually there are slightly more components on board A and C (the 
"rev:3" boards).

BTW, what *are* those absurdly tiny 2-pin devices scattered all over the 
board? Resisters? Many of them have labels printed on the board such as 
"R7". But a few are labelled "C13" or similar...

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