Very curious memory situation ... Toshiba 2805

I have a bunch of Toshiba 2805 laptops. I also have a 16-chip 256MB
SDRAM memory module (other specs unknown). I tried to put this into a
2805-S603 and a 2805-S402 and neither machine POSTS, both machines sound
a single beep and display a "please remove incompatible memory module"
message on the LCD screen.

Yet, the same module works fine in a 2805-S201 and a 2805-S202.

I am speculating that the failure in the two higher end and later models
is "artificial" .... that the module WOULD work, but that the BIOS sees
some parameter that it was programmed to reject and won't allow the
machine to work with that module even though it would.

I have the latest BIOS in all 4 machines.

Kind of frustrating. [Also interesting ... the crucial web site does
not list the Toshiba Satellite 2805 series at all ... it was one of the
most popular series of Toshiba machines of the past 10 years, and these
machines are very, very common].
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