The TXE4E replaced the ten Miniature Threaded Wire Stores (MTWS) of the TXE4 with two units, each containing six chips which were removable and re-programmed with a separate computer. This doubled the program store with an additional bank-switched 5,000 program steps and provided the communication port to interface to the enhancement processors. The Cyclic Stores threading fields (12mS x 156mS and 3 x 36mS) were commoned and all new subscribers, ceases or change of Class Of Service, which were previously threaded, were now done via a terminal.