HISTORICAL DEVELOPMENT OF COMPUTER DEVICES II (UP TO 2OTH CENTURY) - ENIAC, EDVAC, UNIVAC, EDSAC, ABC, PERSONAL COMPUTER (PC)

 HISTORICAL DEVELOPMENT OF COMPUTER DEVICES II (UP TO 2OTH CENTURY)

ENIAC, EDVAC, UNIVAC, EDSAC, ABC, PERSONAL COMPUTER (PC)

Computer Devices Up to 20th Century are:

1. ENIAC

2. EDVAC

3. UNIVAC

4. PERSONAL COMPUTER (PC)

1.ENIAC

In 1946, John Mauchly and J. Presper Eckert completed the ENIAC (Electronic Numerical integrator and Computer). It was the first general purpose computer. ENIAC contained 18,000 vacuum tubes, weighed 30 tons, occupied 1800 square feet of floor space and required 160 kilowatts of electrical power. The ENIAC used punched card for input and output. ENIAC was used by US for hydrogen bomb project and programming.

2. EDVAC

Features and components

The EDVAC (Electronic Discrete Variable Automatic Computer) is the successor of the ENIAC and was made by the same designers: John Mauchly and Presper Eckert in 1949. 

Unlike its predecessor the ENIAC, it was binary rather than decimal. It was the first designed stored  program computer with memory capacity of 1000 words (later set to 1,024 words, thus  giving a memory, in modern terms, of 5.5 kilobytes). It contains 6,000 vacuum tubes and consumed 56 KW of power and covered 490 square feet of floor space.

3. UNIVAC 1

Features and components

The UNIVAC 1 (Universal Automatic Computer 1) was invented by John Mauchly and Presper Eckert in 1951. The machine was 25 feet by 50 feet in length, contained 5,600 tubes, 18,000 crystal diodes, and 300 relays and had an internal storage capacity 1,000 words  or 12,000 characters. It utilized a Mercury delay line, magnetic tape, and typewriter output.  Magnetic tape was still used for input and output. It was the first commercial computer.

4. PERSONAL COMPUTER: Personal Computers are:

a. Mini computer

b. Micro computer

c. Notebook computers

d. Palm Top Computer 

a. Mini Computers

Minicomputers were developed in the mid-1960s. They are a class of smaller general-purpose computers that are digital and generally used in multi-user systems. They have higher processing speed and higher storage capacity than microcomputers. Minicomputers can support up to 4 – 200 users simultaneously
b. Micro Computers

Microcomputers became popular in the 1970s and 1980s. They are relatively small and low-cost. They consist of a CPU, an input unit, an output unit, a storage unit, and the software.
c. Laptop and Notebook Computer

A notebook computer is a battery- or AC-powered personal computer generally smaller than a briefcase that can easily be transported and conveniently used in temporary spaces, such as airplanes, libraries, temporary offices and meetings.

d. Palm Top Computer

A palmtop computer was an IBM-compatible electronic device that was about the size of a large pocket calculator. They came in a clamshell form factor, which allowed them to be used as a handheld device or what could be described as a small laptop computer.

Class Activities

1.a PC stands for ______________

2a. Differentiate between mini & micro computer

 b. UNIVAC stands for

3. What is a palmtop computer?.