The Revised Atari 520ST - with
As opposed to the
Atari 520ST, the joystick/mouse connectors are on the underside of
the machine instead of where the disk drive is.
From what I can
gather, the "f" means floppy, and the "m" stands
for modulator, as this model has RF Output. Thanks
members of comp.sys.atari.st.tech!