 The earlier machine was so slow that these sorts of issues were dealt with simply by checking every physical input in a loop, but with the much faster performance of the new design this was no longer appropriate as most of the tests would reveal no changes and thus be wasted.The system added core memory for temporary storage, replacing the flip-flops from the earlier system, and a plugboard for programming.The first delivery would be to Imperial Chemical Industries (ICI) to go into use as the control system for ICI's soda ash/ammonia plant at Fleetwood.