Sun Fire 280R/ Sun Blade 2000 differences

I have a Sun Fire 280R, which uses the same system board as the
Sun Blade 2000 (and the 1000). However, there are some differences
(other than the housing).

The 280R uses drives 0 and 1 internally, while the 2000 uses
drives 1 and 2.

The 1000 has a pair of firewire ports, while the 280R has them
covered by a welded steel cap, and the OS (Solaris 10) does not seem to
notice the ports.

So -- two questions:

1) *Why* is the firewire disabled in the 280R? Just not needed for
the intended purpose of the machine?


2) How does it *know* to disable it?

Does it base it on the drive numbers?

Does it base it on the presenced or absence of the RSC board?

Does it base it on something in the different power cable to the
Fibre Channel drive backplane?

Does it perhaps base it on the presence or absence of a Creator
3D framebuffer? (There are two slots for them on the 280R, but
the primary one does not have a matching opening for the card
bracket, and the secondary one is used by the RSC card.

None of this is really critical to know -- but curiosity prompts
me to ask.

Thanks,
DoN.
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