On 16 Jun 2009, at 18:00, cctalk-request at classiccmp.org wrote: Thanks for the clarification. So 1964-1959 = 5, 1965.75-1962 = 3.75 and 1966-1962 = 4 so the 360 was around 4 years later that the 1301. Wiped the floor with it though. The only thing 1300 had going for it was sterling arithmetic in hardware. In case anyone's interested the programmer could set a register to the ten shillings position. Digits to the left were normal decimal, the digit itself carried at two, the (shilling) digit to the right carried at 10 as normal, and the next digit (pence) to the right carried at 12, digits further to the right carried at 10, so if you wanted to calculate in farthings (quarters of a penny) you could set it up to have two digits to the right of pence. In all this gave the machine a range of plus or minus 4,999,999pounds 19shillings and 11.99pence, or if you didn't want farthings, plus or minus 499,999,999pounds 19shillings and 11pence, which in 1962 was a LOT of money! The Bank of England had a pair of 1301s. Roger Holmes.