This is a Eclipse S120 CPU with 256Kb RAM listed in my parts reference as ASSY 256KB W/FIRMW FLTG POINT.
More on this PCB in due course once it leaves ‘The Shed’ and has undergone bench testing.
005-017624 – Eclipse S/120 CPU 256Kb
Data General Nova, Eclipse, MV and AV
Data General Preservation and Restoration