There is always a way :-) I assume you have Workbench installed to hard disk on your A1200? If so have a look in the Storage/DOSDrivers drawer on your Workbench partition. Double click the PC0 icon. Put a double density disk in the floppy drive and format the PC0 device. This disk will then be read-/writeable on the Amiga and a PC. Then go to Aminet on your PC and download
this. Copy it to the floppy disk, install it on your Amiga (you will need to read the docs and follow the installer carefully) and that should get your Amiga online.
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moto