साँचा:Early computer characteristics

Defining characteristics of some early digital computers of the 1940s (In the history of computing hardware)

Name	First operational	Numeral system	Computing mechanism	Programming	Turing complete
साँचा:rh| Zuse Z3 साँचा:small	May 1941	Binary floating point	Electro-mechanical	Program-controlled by punched 35 mm film stock (but no conditional branch)	Yes साँचा:small
साँचा:rh| Atanasoff–Berry Computer साँचा:small	1942	Binary	Electronic	Not programmable—single purpose	No
साँचा:rh| Colossus Mark 1 साँचा:small	February 1944	Binary	Electronic	Program-controlled by patch cables and switches	No
साँचा:rh| Harvard Mark I – IBM ASCC साँचा:small	May 1944	Decimal	Electro-mechanical	Program-controlled by 24-channel punched paper tape (but no conditional branch)	No
साँचा:rh| Colossus Mark 2 साँचा:small	June 1944	Binary	Electronic	Program-controlled by patch cables and switches	No
साँचा:rh| Zuse Z4 साँचा:small	March 1945	Binary floating point	Electro-mechanical	Program-controlled by punched 35 mm film stock	Yes
साँचा:rh| ENIAC साँचा:small	July 1946	Decimal	Electronic	Program-controlled by patch cables and switches	Yes
साँचा:rh| Manchester Small-Scale Experimental Machine (Baby) साँचा:small	June 1948	Binary	Electronic	Stored-program in Williams cathode ray tube memory	Yes
साँचा:rh| Modified ENIAC साँचा:small	September 1948	Decimal	Electronic	Read-only stored programming mechanism using the Function Tables as program ROM	Yes
साँचा:rh| EDSAC साँचा:small	May 1949	Binary	Electronic	Stored-program in mercury delay line memory	Yes
साँचा:rh| Manchester Mark 1 साँचा:small	October 1949	Binary	Electronic	Stored-program in Williams cathode ray tube memory and magnetic drum memory	Yes
साँचा:rh| CSIRAC साँचा:small	November 1949	Binary	Electronic	Stored-program in mercury delay line memory	Yes