1x9 SIMMs are parity - that's why they're 1x9 instead of 1x8. That
extra bit is the parity bit.
Back in the sad, painful days when I worked tech support for a PC
clone company (which was a couple years back, right at the tail end of
the 30-pin dynasty :), only a couple of PC brands used non-parity
SIMMs. They were mostly a Macintoshism at the time. IBM used parity,
and therefore so did most of the clonemakers, with the exception of
the late, not-very-lamented Leading Edge and a couple of other even
more obscure manufacturers.
It's odd to see the situation so radically different now...
--G.
-- benjamin d. hutchins gryphon@livingston.com a minion of livingston enterprises texaport bellnet 800-458-9966 -><- fax 510-426-8951 www.livingston.com <*> ride the wild rhino