Williams and Kilburn built the Small-Scale Experimental Machine at Manchester University as the smallest practicable computer to check out the CRT store later to become known as the “Williams Tube” store. The SSEM was also known familiarly as the Baby Machine.

It successfully ran a factorising program written by Kilburn on the morning of 21^st June 1948, believed to be the first time a stored program had ever run on an electronic computer anywhere in the world.

Further development and additions to the SSEM led to a machine suitable for productive computing, referred to as the Manchester University Mark I, from mid-1949 onwards. In turn, this was developed and engineered by Ferranti Ltd to become the Ferranti Mark I and Mark I* computers (see also here).

Because of the simplicity and historical importance of the SSEM, several emulators are in existence. Included here are:

32 64	madm.zip containing an emulator for MS-DOS by Lee Wittenberg
64	wmadm.zip containing an emulator for Windows by Lee Wittenberg.
	to the website of an emuator by David Sharp written in Java (and hence available across a wide range of platforms) either as an application or as an applet. This emulator is on display next to the SSEM replica at MSI and is strongly recommended by the SSEM replica team.