Updated: 2021/Apr/14

SF2R(4)                      Device Drivers Manual                     SF2R(4)

     sf2r - SoundForte RadioLink SF16-FMR2 FM radio device driver

     option RADIO_TEA5759

     sf2r0  at isa? port 0x384
     radio* at sf2r0

     The sf2r driver provides support for the SF16-FMR2 FM radio tuners.

     The SF16-FMR2 is a stereo FM tuner that allows to tune in the range 87.5
     - 108.0 MHz, report signal status on the current frequency, force audio
     output to mono, perform hardware signal search, and has an internal AFC.

     The SF16-FMR2 cards take only one I/O port.  The I/O port is set by the
     driver to the value specified in the configuration file and must be

     Philips Semiconductors released two almost identical chips TEA5757 and
     TEA5759.  The TEA5757 is used in FM-standards in which the local
     oscillator frequency is above the radio frequency (e.g. European and
     American standards).  The TEA5759 is the version in which the oscillator
     frequency is below the radio frequency (e.g. Japanese standards).  The
     option RADIO_TEA5759 changes the algorithm of frequency calculation for
     the TEA5757 based cards to conform with the Japanese standards.

     isa(4), radio(4)

     The sf2r device driver appeared in OpenBSD 3.0 and NetBSD 1.6.

     The sf2r driver was written by Vladimir Popov and Maxim Tsyplakov. The
     man page was written by Vladimir Popov.

     MediaForte made two variants of the SF16-FMR2 cards, the first one has an
     internal amplifier of the output sound, the second one does not have such
     an amplifier.  The current driver supports only the second variant.

NetBSD 9.99                     August 25, 2020                    NetBSD 9.99