3028	 The Manchester Mark I and Atlas A His torical Perspective	 In years of computer design at Manchester University two systems stand out the Mark I developed over the period - and the Atlas - . This paper places each computer in its his torical context and then describes the architecture and system software in present-day terminology. Several design concepts such as address-generation and store management have evolved in the progression from Mark I to Atlas. The wider impact of Manchester innovations in these and other areas is discussed and the contemporary performance of the Mark I and Atlas is evaluated. architecture index registers paging virtual storage extra codes compilers operating systems Ferranti Manchester Mark I Atlas ICL
