well stacks typically grew downwards even before there were heaps (but not always - Burroughs large systems for example) Heaps of course can grow downwards Wi

well stacks typically grew downwards even before there were heaps (but not always - Burroughs large systems for example) Heaps of course can grow downwards With modern 64-bit address spaces actual running out of space is not an issue (especially since we're dynamically moving around code, heaps and stacks for security reasons anyway)