More on 66Mhz & Universal keyed card test systems.

["O'Shea, David J" <david.j.oshea@intel.com>]

Someone just pointed out that the Intel L440GX+ boxed 
motherboard has two 32-bit 66Mhz slots.

They keying on the slots is a touch odd.   They are keyed
as 5V slots.   The idea is that the busses would work at 
5V signalling with 5V cards, and 3V signalling with universally
keyed 3V cards.

This is done using the Intel 21150 AGP bus to PCI bus bridge
in its 66Mhz PCI bus version.  (See developer.intel.com).  There
may be other 440GX based products that use the 21150 device
as well, but I am unfamiliar with them.

I don't know anything about the 21150 chip.  

Working for Intel, I think I won't comment on the unique
slot keying, especially since I don't know how the chip works.

But, if you are looking for a 32-bit, 66Mhz slot (that must
use 3V signalling by specification) that takes universally
keyed PCI devices and is also an apparently 5V tolerant 5V keyed
(same slot) at 33Mhz slot, then this seems the buy
for you.  That board is fairly inexpensive.  It strikes me
from looking at it that this motherboard will not except
32-bit 66Mhz devices that are keyed only for 3.3V volt
operation.  The 66Mhz device must be keyed for universal
operation based on the 5V keyed connectors that appear in
the pictures on developer.intel.com

-David O'Shea