>> I have downloaded and installed netBSD current some days ago.
>> It work fine (ps also, thanks to Bill Studenmund) but at boot
>> time the kernel (generic#30 - 31 and finally madhatter#39 -40)
>> give the message:
>> 
>> ae0 at nubus0: failed to determine size of RAM.
>> 
>> Technical specifications tell me that  the ethernet controller
> of my card is National Semiconductor DP83932 (SONIC).
>
> Weird. If your card has a SONIC chip on it (not to be confused with SONIC
> ethernet cards, a card manufacturer), then it should NOT be using the
> ae driver. It should be using the sn driver (sn0). Probably the kernel
> needs to be taught how to tell your card from the other ones..

  Could you run Slots (available at
ftp://ftp.apple.com/devworld/Tool_Chest/Devices_-_Hardware/NuBus_Slot_Manager/Slots.sit.hqx)
and send the line
which begins with "Network_Ethernet_...". The ae driver is
apparently claiming that board inappropriately.