Unfortunately this question has no easy answer because of all the different types of classifications and types of computers Keep in mind that early inventions such as the abacus, calculators, tablet machines, difference machine, etc. are not accounted for in this document.

First programmable computer

The Z1 originally created by Germany's Konrad Zuse in his parents living room in 1936 to 1938 is considered to be the first electrical binary programmable computer.

See our Zi http://wiki.answers.com/../jargon/z/z1.htmfor additional information about this computer.

The first digital computer

Short for Atanasoff-Berry Computer, the ABCstarted being developed by Professor John Vincent Atanasoff and graduate student Cliff Berry in http://wiki.answers.com/../history/190040.htmand continued to be developed until 1942 at the Iowa State College (now Iowa State University). On October 19, 1973, US Federal Judge Earl R. Larson signed his decision that the ENIAC patent by Eckert and Mauchly was invalid and named Atanasoff the inventor of the electronic digital computer.

See our http://wiki.answers.com/../jargon/a/abc.htmfor additional information about this computer.

The ENIAC was invented by J. Presper Eckert and John Mauchly at the University of Pennsylvania and began construction in http://wiki.answers.com/../history/194060.htmand was not completed until http://wiki.answers.com/../history/194060.htm. It occupied about 1,800 square feet and used about 18,000 vacuum tubes, weighing almost 50 tons. Although the Judge ruled that the ABC computer was the first digital computer many still consider the ENIAC to be the first digital computer.

See our http://wiki.answers.com/../jargon/e/eniac.htmfor additional information about this computer.

Because of the Judge ruling and because the case was never appealed like most we consider the ABC to be the first digital computer. However, because the ABC was never fully functional we consider the first functional digital computer to be the ENIAC.

The first transistor computer

The TX-O (Transistorized Experimental computer) and first transistorized computer is demonstrated at the Massachusetts Institute of Technology in http://wiki.answers.com/../history/194060.htm.

The first stored program computer

The early British computer known as the EDSAC is considered to be the first stored program electronic computer. The computer performed its first calculation on May 6, http://wiki.answers.com/../history/194060.htmand was the computer that ran the first graphical computer game.

See our http://wiki.answers.com/../jargon/e/edsac.htmfor additional information about this computer.

The first minicomputer

In http://wiki.answers.com/../history/196080.htm http://wiki.answers.com/../comp/digital.htmreleased its first of many PDP computers the http://wiki.answers.com/../jargon/p/pdp.htm.

The first personal computer

In 1975 Ed Roberts coined the term personal computer when he introduced the http://wiki.answers.com/../jargon/a/altair.htm8800. Although the first personal computer is considered to be the Kenback-1, which was first introduced for $750 in 1971. The computer relied on a series of switches for inputting data and output data by turning on and off a series of lights.

The Micral is considered the be the first commercial non-assembly computer. The computer used the Intel 8008 processor and sold for $1,750 in 1973.

The first workstation

Although never sold the first http://wiki.answers.com/../jargon/w/workstat.htmis considered to be the http://wiki.answers.com/../comp/xerox.htmAlto, introduced in 1974. The computer was revolutionary for its time and included a fully functional computer, display, and http://wiki.answers.com/../jargon/m/mouse.htm. The computer operated like many computers today utilizing http://wiki.answers.com/../jargon/w/windows.htm, http://wiki.answers.com/../jargon/m/menu.htmand http://wiki.answers.com/../jargon/i/icon.htmas an interface to its operating system.

The first laptop or portable computer

The first portable computer or http://wiki.answers.com/../jargon/l/laptop.htmis considered to be the Osborne I, a portable computer developed by Adam Osborne that weighed 24 pounds, a 5-inch display, 64 KB of memory, two 5 1/4" floppy drives, and a http://wiki.answers.com/../jargon/m/modem.htm.

http://wiki.answers.com/../comp/ibm.htmPCD later released the IBM portable in 1984, it's first portable computer that weighed in at 30 pounds. IBM PCD later announced in 1986 it's first laptop computer, the PC Convertible, weighing 12 pounds. And in 1994 introduces the IBM ThinkPad 775CD, the first notebook with an integrated http://wiki.answers.com/../jargon/c/cdrom.htm.

The first PC (IBM compatible) computer

In http://wiki.answers.com/../history/194060.htm http://wiki.answers.com/../comp/ibm.htmshipped its first electric computer, the http://wiki.answers.com/../jargon/num/701.htm. Later IBM introduced its first personal computer called the "IBM PC" in 1981. The computer was code named and still sometimes referred to as the "Acorn" and had a http://wiki.answers.com/../jargon/num/8088.htmprocessor, 16 KB of memory, which was expandable to 256 and utilizing http://wiki.answers.com/../jargon/m/msdos.htm.

The first PC clone

The first http://wiki.answers.com/../jargon/c/clone.htmwas developed by http://wiki.answers.com/../comp/compaq.htm, the "Compaq Portable" was release in March 1983 and was 100% compatible with IBM computers and software that ran on IBM computers.

See the below Answers.comfirst for other IBM compatible computers

The first Apple computer

http://wiki.answers.com/../people/s.htmdesigned the first Apple known as the http://wiki.answers.com/../jargon/a/applei.htmcomputer in http://wiki.answers.com/../history/196080.htm.

The first computer company

The first computer company was the Electronic Controls Company and was founded in http://wiki.answers.com/../history/194060.htmby J. Presper Eckert and John Mauchly, the same individuals who helped create the ENIAC computer. The company was later renamed to EMCC or Eckert-Mauchly Computer Corporation and released a series of mainframe computers under the http://wiki.answers.com/../jargon/u/univac.htmname.

The first multimedia computer

In 1992 http://wiki.answers.com/../comp/tandy.htmRadio Shack becomes one of the first companies to release a computer based on the http://wiki.answers.com/../jargon/m/mpc.htmwith its introduction of the M2500 XL/2 and M4020 SX computers.

Other major computer company firsts

Below is a listing of some of the major computers companies first computers.

Compaq - March 1983 http://wiki.answers.com/../comp/compaq.htmreleased its first computer and the first 100% IBM compatible computer the "Compaq Portable."

Dell - In http://wiki.answers.com/../history/198090.htm http://wiki.answers.com/../comp/dell.htmintroduced its first computer, the "Turbo PC."

Hewlett Packard - In 1966 Hewlett Packard released its first general computer, the "HP-2115."

NEC - In http://wiki.answers.com/../history/194060.htm http://wiki.answers.com/../comp/nec.htmbuilds its first computer the "NEAC 1101."

Toshiba - In http://wiki.answers.com/../history/194060.htm http://wiki.answers.com/../comp/toshiba.htmintroduces its first computer, the "TAC" digital computer.

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