Compatibility of serial adapters

[Peter Easthope]

Seems that an adapter such as http://www.ebay.ca/itm/381346598663 ,
similar to the first generation adapter, might work.  The concluding
sentence in
http://wiki.laptop.org/go/Serial_adapters#First_generation_serial_adapter
is "This only works on the XO-1."  What prevents it from working on an
XO-1.5?  Can anyone elaborate on this compatibility topic?

Thanks,       ... Peter E.

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