My old calculator of this model dies.  It was a mere 20ish years old.  I tried upgrading to TI-30XIIS with its fancy dual power and two line output.  But, in the end, I am again using a TI 30XA.  When I tell it 1+2+3+4=, it says 1+2=3+3=6+4=10, where as the new fangled 30xIIS says merely 1+2+3+4=10.  In accounting and other things, the subtotals matter too.  I hope this new one last 20 years too.