Changes
/* Ready / Disk Changed signal */
This signal differs between floppy drives model:
*For 3inch floppy drives (pin26), it is a "Ready" signal. The /RDY signal is sent active whenever a disk is installed and rotating in the drive.
*For 3.5inch floppy drives (pin34), it is a "Disk Changed" signal. The /DSKCHG signal determines whether the same disk loaded during the previous disk access is still in the drive.
