/* Technical */
Port F0E0h - Draysoft Doubler External Tape Data Input (Bit5) (Read Only)
The Doubler software (Side A) forwards Port F0E0h.Bit5 to PPI.PortC.Bit5.
The Speedcop software (Side B) is a baudrate conversion tool, allowing to select 1000, 2000, or 3000 bps (it's using only the internal recorder, ie. this program is not using the external hardware at all).