In the CPC the DS1 signal of the FDC is not connected, making it impossible to select floppy drives 2 and 3. The floppy drives 0 and 1 are selected instead.
== Pin34 (Ready / Disc Changed) signal ==
The signal on pin34 differs between floppy drives model.:
For 3inch floppy drives, it is a "Ready" signal. The RDY signal is sent whenever a disk is installed and rotating at correct speed in the drive.