ENIAC

What does ENIAC stand for?

ENIAC stands for "Electronic Numerical Integrator and Computer".

Which was the first general purpose digital computer?

ENIAC was the world's first general purpose digital computer.

What was some salient features of ENIAC?

Memory size : 20×10 digits
word length: 10 digits
Weight: 30 tons (30,000 Kg)
Dimension: 1,500 square feet.
Power consumption: 140 kilowatts ≈ 300 Macbooks power consumption
Cost: $400,000

Source:-Britannica

Was ENIAC a binary machine?

No, ENIAC was not a binary machine.
It was a decimal machine.

Which number system was used by ENIAC?

Decimal number system was used by ENIAC.

How was a decimal number represented in ENIAC?

To represent a digit, 10 vaccum tubes were arranged in a ring fashion. Each tubes were assigned a unique digit(0-9). At a time only one of these tubes can be in "ON" state. This tube in "ON" state represents the digit.

Where were instructions and data stored in ENIAC?

Data were stored in the 20 accumulators of the ENIAC. These accumulators work as the memory for ENIAC.
There was no facility for storage of instructions. Instructions were provided to the ENIAC manually. This is done through switching and cabling.