> > But you could instead put 7 on the low side ? Each resistor is
> > then effective for a column, not a row
> 
> But there'll be different amounts of LED's on at a time in a column,
> so the fewer LED's that are lit, the brighter they'll be

If you were using fixed timing, yes. But your s/w knows how many
LEDs should be on (it does doesn't it ? It checks for a win ?) so it
can adjust the 'on' time to suit

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