NASM Forum > Programming with NASM

pmode cdrom read

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alexBishop:
Can anyone please show me how to read from a cdrom in protection mode, (without switching to real mode or v86 mode), is there a set of io ports for doing this and if so how are they used.

Frank Kotler:
Hi Alex,

This may help...

http://wiki.osdev.org/ATAPI

My understanding is that not all cd roms follow the ATAPI spec. Older ones, in particular, may use a different interface. I think some of 'em used to masquerade as an IDE drive (I think I've got some code to read an IDE drive via ports... but rmode).

Best,
Frank

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