Alas, with PLATO you'd have to find a Control Data mainframe somewhere: CDC machines, developed by Seymour Cray, had 64-bit variables..... the whole thing got re-jiggered to run on IBM mainframes, then PC versions were developed, but my research stuff was not in any of that, not being owned by PLATO as part of its teaching materials. (I have no idea what if anything happened to my Chaucer and History of English lessons.)
It's almost worth keeping a bunch of old machines running in a library somewhere.