Hi Davide,

> Just for curiosity (for sure discussed many times in the past): why the
> QL-SD interface is not compatible with GD or SGC?

You mean GC, not GD I assume. It is mainly a SGC issue, some users 
reported GC to work with QL-SD.

The slewrate of some SGC signals is too fast for the QL motherboard. 
As a consequence, the SGC produces illegal electrical signals inside 
the QL, which can cause QL-SD to malfunction. 

Because the disturbances have a high frequency, they are not "seen" 
by the slow components of the QL itself, but only by the much faster 

My guess is that replacing the QL motherboard could fix this issue. 
Unfortunately, I have no Aurora system to try.


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