Hello Christian,

If you want a real floppy controller you can buy a system controller from
National, or others, in SMC (difficult to sold), or find a FDC from Western
Digital, WD179X (28 pins DIL) in a scrap computer, about 10 years old.

Other idea (difficult) : you implement a FDC via VHDL, into a FPGA.
Your guideline should be a data sheet of a real component with his
structural description. Search in an old data book of Western Digital.

A Triscend E5 chip, with macrocells, is an addition of a 8051 with a
FPGA.

Best regards,
J. M.