DEC UNIBUS and use of cassette

[Bill Degnan via cctalk]

Was there a UNIBUS storage system that used a cassette player as the
storage device (like an old Panasonic or RadioShack cassette player),
rigged to send receive signals via a serial card connection.  I.e. the
system would have one serial card for the terminal and another serial card
on a different port for the cassette player?  It might have to load as if
it was a high-speed papertape but it in theory would work.
Bill