How can I use emulator up to 1000 floppies?
You can't use the Floppy Emulator with the equivalent of 1000 floppies. According to the description on the developer's website, you can use Floppy Emulator and the device with up to 100 floppies.
To find additional information about it, access the official website: http://www.ipcas.com//products/usb-floppy-emulator-fdd-to-udd.html