History of computing hardware Early digital computer characteristics Early digital computer characteristics

| Name_ | First_operational | Numeral_system | Computing_mechanism | Programming | Turing_complete_ |
|---|---|---|---|---|---|
| Zuse Z4 (Germany) | March 1945 | Binary floating point | Electro-mechanical | Program-controlled by punched 35 mm film stock | Yes |
| ENIAC (US) | July 1946 | Decimal | Electronic | Program-controlled by patch cables and switches | Yes |
| Manchester Small-Scale Experimental Machine (Baby) (UK) | June 1948 | Binary | Electronic | Stored-program in Williams cathode ray tube memory | Yes |
| Modified ENIAC (US) | September 1948 | Decimal | Electronic | Read-only stored programming mechanism using the Function Tables as program ROM | Yes |
| Manchester Mark 1 (UK) | April 1949 | Binary | Electronic | Stored-program in Williams cathode ray tube memory and magnetic drum memory | Yes |
| EDSAC (UK) | May 1949 | Binary | Electronic | Stored-program in mercury delay line memory | Yes |
| CSIRAC (Australia) | November 1949 | Binary | Electronic | Stored-program in mercury delay line memory | Yes |