From: Daniel Egger <[EMAIL PROTECTED]>
   Date: Wed, 5 Jan 2005 23:08:33 +0100

   > canon rebel uses DOS.

   Possibly only as a bootloader or datashifter.

   According to
   http://www.alexbernstein.com/wiki/CanonDigitalRebelHacking
   the camera has three different processors and it is more than
   unlikely that the 80186 compatible processor is used for much
   more than filesystem handling and starting a different operating
   system or delegating the work to dedicated ASICs.

I would guess the latter -- delegating the work to dedicated ASIC's.
Generating JPEG's from raw files is a very specialized task that's
very compute-intensive in some ways but which could probably be
implemented quite cheaply in hardware.
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