Few will remember 30 years ago... check the back to see how it's fixed on - they were often tacked on with tiny nails - this will have to come off first. Then the doors.
lay it on its back and attempt to remove the top and the base. The general case then (as I recall) and now as far as I know - is that the only tool you should need is a cross point screwdriver.
Good luck
Peccavi
June 2011