Here are the instructions to reverse the Escom AT1200 motherboard modification to restore its compatibility with standard Amiga floppy drives.
http://www.softpres.org/article:hard..._fdd_connector
And, if your A1200 is fitted with the Panasonic JU-257A605P (which many of them are), then here are the instructions to make it compatible with both the restored motherboard and certain troublesome games and demos.
http://www.softpres.org/article:hard...u-257a605p_fdd