user: Question: what's the computing mechanbeingm with first operational being February 1944
Columns: ['Name', 'First operational', 'Numeral system', 'Computing mechanism', 'Programming', 'Turing complete']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Atanasoff–Berry Computer (US)', '1942', 'Binary', 'Electronic', 'Not programmable—single purpose', 'No']
SQL:

assistant: SELECT "Computing mechanism" FROM "Table" WHERE "First operational" = 'February 1944';