His latest installment is an article describing the strange implementation of the IBM 1401’s qui-binary arithmetic. Full disclosure: It has not been confirmed that [Ken] is an “old-timer ...

There are four rules that need to be followed when adding two binary numbers. These are: 0 + 0 = 0 1 + 0 = 1 1 + 1 = 10 (binary for denary 2) 1 + 1 + 1 = 11 (binary for denary 3) ...