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I have a problem. In Bochs, ATAPI devices (ie. CD-ROM drives) are deteced without any trouble. But as soon as I test on a real PC, it stops working all of a sudden. Identify device doesn't return the 'PACKET' device signature it's meant to when it hits a CD drive.

Could it be something with the timing in Bochs and a real PC?

I have found that real hardware doesn't always set the signature for the drive properly after a reset. The way I get around this is by first sending the normal identify command and if that aborts then I send a identify packet device command.