As you specifically mention problems with the ALE pin:
An RC lowpass (with a capacity well below 100pF) is used in some designs. But your ALE line is short anyway isn't it?

Hi Frieder,

Nice to here from you, you are quite right, the ringing is the same at cpuclock=10Hz=32MHz, you just can't see it at 10Hz since you would need fancy scope to see at 10Hz but when running at 12MHz or 30MHz it becomes visible on my humble scope. However, this ringing is by no means serious in any way, my well thought out ATMEL AT89C51ED2 cpu runs fine no problems.
This ringing tells me how thoughtful the Atmel designer's have been regarding cpu gain signiture.I can deactivate the ALE pin quite easily, just by setting a certain bit in sfr, but no need as it does no harm leaving as is.
Nmos fab is very tame, perhaps read my other posts maybe for a better understanding into my central issue regarding high frequency and power. Hope this helps, by the way would 'old europe' perhaps take me in as a refugee in your country as you seem to light years ahead of the U.K. in many respects.

Many Happy returns
Darren