On 05.01.2005, at 22:37, Carol Spears wrote:
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.
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