ENIAC was the first general-purpose electronic digital computer, while UNIVAC I was the first computer to process both numeric and textual data. The Harvard Mark I was the first computer to successfully execute a stored program in June 1948, demonstrating the stored-program concept. EDSAC was an early stored-program computer developed at the University of Cambridge.

1. ENIAC
ELECTRONIC
NUMERICAL
INTEGRATOR AND
CALCULATOR

2. UNIVAC I
•Universal Automatic Calculator I
•UNIVAC I was the first computer to
handle both numeric and textual
information.

3. MARK I
•Automatic Sequence Controlled
Calculator
•Harvard Mark I
•It successfully executed its first
program in June 1948

4. EDSAC
•Electronic Delay Storage
Automatic Calculator