Atom 101 manufactured 1994-1996
Assume no more as the Atom Site says it is a Ryobi A31 (31CC)engine which is basically the same engine as the MTD A31 just with different carby/muffler cover. Didn't any IPLs for the edger there but someone should be to point you in the right direction that knows the Ryobi A31 but it is the same engine the is on the Ryobi 760 trimmer but with different fuel tank and covers.
Link to Atom Site >
Atom Manuals and info