as i understand it, it had conditional jumps but no index registers, self-modifying code, or indirect jumps, so i think you couldn't build subroutines or data s

as i understand it, it had conditional jumps but no index registers, self-modifying code, or indirect jumps, so i think you couldn't build subroutines or data structures such as arrays See the links to a detailed architecture description from the book by Bell and Newell in my post at top level here. They thought it was a real computer -- just barely.