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i need to know whether cd drive or not form dos. i need c c++ or assembly code to detect that.
interrupt or pnp api function for the above.

any idea please reply.

Search the Interrupt List for MSCDEX. There's bound to be a detect call in there somewhere.

If it's an ATAPI CD-ROM, I believe you can query the ATA/IDE controller to see if a CD-ROM drive is present.

If it's SCSI, however, you'll have to research the SCSI controller you're using, 'cuz they're all different.

Cheers,
Jeff

yes, it is an atapi cd-rom. i have tried the int13h with ah=48h. given the buffer size as 48h but after the int call the size assigned is showing only 26 (base 10)value in the starting location of the buffer. so what can i do ?

if it is 66 itself then i can try the string stored in 28h for ata , atapi or like that

what can i do for that

help me

You'll probably have to actually query the IDE controller directly.  Take a look at the IDE identify command.

Cheers,
Jeff

This old message may contain a small amount of helpful information:

http://www.osdev.org/board.jsp?message=2844

i go through the message in
http://www.osdev.org/board.jsp?message=2844

but i did know how to send the Identify Packet Device command (0xa1)
please reply me how it is possible