Entry
R7 = pointer to CDFS control block (as obtained from SWI CDFS_ConvertDriveToDevice)
Exit
R0 - R1 preserved
R2 = drive type given by CDFS driver, or - 1 if type not recognised
This call gets the drive type of a CD-ROM drive, so that other CD_SWIs can be made. It can be made by CDFS, the PCEmulator driver or !CDPlayer.
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