Personal Computer Milestones

Personal Computer Milestones

Pop Quiz: What was the first personal computer?

Be careful before you answer! The question is highly ambiguous. Are
you sure you know what first means? How about personal?
Even computer is an ambiguous term!

We’ll make it easy for you. Let’s define personal computer as
a computer having the following attributes:

  • It must be a digital computer.
  • It must be largely automatic.
  • It must be programmable by the end-user.
  • It must be accessible, either as a commercially manufactured product,
    as a commercially available kit, or as widely published kit plans.
  • It must be small enough to be transportable by an average person.
  • It must be inexpensive enough to be affordable by the average professional.
  • It must be simple enough to use that it requires no special training beyond
    an instruction manual.


Was it the IBM PC?

Bzzzt! The IBM PC was introduced in 1981. It was perhaps the first to
wear the “PC” label, but that was IBM’s only innovation. They sure sold
a bunch of them, though.
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IBM 5150 PC 1981 ? 8088/VLSI desktop

Was it the Apple ][?

No, the 1977 Apple ][ was the first highly successful mass-produced personal
computer, but not the first personal computer. Nor was the 1976 Apple 1, which
can be considered an Apple ][ prototype since only 200 or so were made.

The Apple 1 signaled the end of toggle switches and blinkenlights, and
launched the interactive graphical microcomputer as a new class
of machine.

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Apple Apple ][ April 1977 $1295 6502/LSI desktop
Apple Apple 1 May 1976 $666 6502/LSI single-board

Was it the IBM 5100?

Good answer! But no, the IBM 5100, introduced in September 1975, was IBM’s first
personal computer, but it was priced too high for most people to have
considered. Pricing was as follows:

Memory BASIC APL Both
16K $8,975 $9,975 $10,975
32K $11,975 $12,975 $13,975
48K $14,975 $15,975 $16,975
64K $17,975 $18,975 $19,975

The 5100 was just one of several personal computers IBM made before the PC.
It was followed by the 5110, the 5120,
the Datamaster, and then finally the 5150 PC.

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IBM 5100 portable Computer September 1975 $9000-$20,000 LSI portable all-in-one
IBM 5110 1978 ? LSI? portable all-in-one
IBM 5120 1980 ? LSI? all-in-one with build-in 8″ floppies
IBM Datamaster 1981 ? LSI/8085 all-in-one with build-in 8″ floppies

Was it the MITS Altair?

You’re way off! The Altair, introduced in January 1975, was the first computer to be produced in
fairly high quantity, and it was the first computer to run Microsoft
software, but we’re not sure that’s a good thing.

Unfortunately for computer history buffs, the Altair is often mistakenly
called the first personal computer by Microsoft-loving journalists who
don’t know any better.

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MITS Altair 8800 January 1975 $439 for kit, $621 assembled 8080/LSI S-100 desktop box

Was it the Mark-8?

Nope, but the Mark-8 (1974) was the first microcomputer kit with plans published
in a popular magazine. The Mark-8 provided the first big spark that catalyzed
the hobbyist movement.

Before the Mark-8 appeared, there was at least one
hobbyist newsletter, the ACS Newsletter, published by the Amateur Computer Society, which focused
primiarily on the PDP-8, the machine which inspired the Mark-8.
The Mark-8 spawned a few more hobbyist newsletters, such as Hal Singer’s Micro-8 and
Hal Chamberlin’s The Computer Hobbyist.

The machine was designed by Jon Titus.

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Radio Electronics Mark-8 July 1974 $5 for assembly plans 8008/LSI desktop kit

Was is the Scelbi-8H?

No, but the Scelbi-8H (1973) was another microcomputer that preceded the
Altair. Like the Altair, it was available from the manufacturer both as
a kit and as a pre-assembled computer.

The machine was designed by Nat Wadsworth.

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Scelbi 8H 1973 $565 8008/LSI desktop

Was it the HP 65?

No. Some people consider the HP 65, introduced in 1973, a mere calculator, but it was fully
programmable; you could even play games on it. HP even called it a personal
in their introductory article in the HP Journal, but
it wasn’t the first.
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Hewlett Packard 65 1973 $795 LSI handheld

Was it the Xerox Alto?

You’re getting warmer. The Alto, introduced in 1973, but never commercially
produced, was perhaps the most innovative design in computer history: it
had a mouse, a GUI, an object-oriented OS and development tools, and
fast networking with the first ethernet cards. These are features
that wouldn’t be common until 10 years later, and even 20 years later
some of them were still cutting edge.
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Xerox Alto April 1973 N/A MSI workstation

Was it the Micral?

No, but the French Micral (1973) was yet another commercial microcomputer
that preceded the Altair. It has been said that the term “microcomputer”
was coined to describe the Micral. This is not true; Intel was using the
term “micro computer” to describe its MCS-4 and MCS-8 chip sets from the very
beginning (MCS stood for Micro Computer Set).

It has also been said that the Micral is the earliest non-kit microcomputer.
This might be true only in a very narrow sense. Intel themselves made
earlier microcomputers, such as the SIM4 and Intellec-4, and Intel advertises
design wins such as the Seiko S-500 desktop computer as early as March 1973.

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Micral Micral 1973 $1750 8008/LSI desktop

Was it the Intel SIM4?

The Intel MCS-4-based SIM4 (1972) was the first microcomputer, but not the first
personal computer.

The single-board SIM4-02 is shown at the right plugged
into an Intel MCB4 chassis along with a PROM programmer card. (The machine belongs to Dwight Elvey, and the photo was taken by
Doug Coward.)

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Intel SIM4-01 1972 ? 4004/LSI single-board

Was it the HP 9830?

Good guess! The HP 9830, introduced in 1972, was the first desktop
all-in-one computer. It even had BASIC in ROM, but few people know
about it because HP marketed it primarily to scientists and engineers,
very quiet people.

Even earlier (1968), HP produced a similar desktop machine called the
9100. However, since it didn’t have a full alphanumeric keyboard or
display, it is generally considered a sophisticated programmable calculator
rather than a general-purpose computer. According to
one researcher,
the term personal computer was first used to describe the 9100A.

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Hewlett Packard 9830A 1972 $5975 MSI desktop all-in-one

Was it the Kenbak-1?

The what? Oh, the Kenbak was designed by John Blankenbaker, introduced in 1971 and sold through small
ads in magazines like Scientific American. It was affordable
and small, but far from the first.

This otherwise obscure machine was named “first personal computer” by
a smart group of judges under the auspices of a contest held by The Computer
Museum in Boston in 1986.

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Kenbak Kenbak-1 1971 $750 MSI desktop

Was it the Imlac PDS-1?

Whoa! Where’d you hear about the Imlac? The little-known Imlac PDS-1, introduced
in 1970, was the first personal graphics computer. MIT hackers used
it to play MazeWar over the ARPANET well before the Xerox Alto could
do the same.

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Imlac PDS-1 1970 ? SSI, core memory workstation

Was it the Paperclip Computer?

I don’t think so. The “paperclip computer” was introduced in 1967
in a book called How To Build a Working Digital Computer by
Alcosser, Phillips, and Wolk. The book describes how you can build
a simple computer with things around the house, like paperclips for
switches, and a tin can for drum memory.

In 1969, a company called COMSPACE created a “professional” version of
this computer called the
Arkay CT-650.

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Alcosser, Phillips, and Wolk Paperclip Computer 1967 $3.75 + parts paperclips, tin can, knife switches desktop
COMSPACE Arkay CT-650 1969 $1000 relay desktop

Was it the Honeywell Kitchen Computer?

He he! Stop; you’re killing me! Incredibly, around 1966 Honeywell tried to
enter the home computer market with the Kitchen Computer. Cutting board

The same computer, sans cutting board, was used by BBN to build the
IMP’s that powered the ARPANET.

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Honeywell Kitchen Computer (based on DDP-516) 1966 $7000 SSI, core memory appliance

Was it the DEC PDP-8?

No, but the PDP-8, introduced in 1965, was available as a desktop model
as early as 1968, and while it was too expensive for most people, and
required racks of peripherals to be useful, it was very personal for
its time.

The PDP-8 inspired Steven Gray to found the Amateur Computer Society
and publish the ACS Newsletter, the first spark of the hobbyist movement
predicted by Edmund C. Berkeley almost 20 years earlier.

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DEC PDP-8 1965 ? SSI, core memory desktop

Was it the Minivac 601?

Very close, but no. Like some of the earliest computers, the Minivac
was relay based, but unlike the early room-filling monsters, the
Minivac had only six relays and was easily afforded by almost anybody
interested in computers.

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Scientific Development Corporation Minivac 601 1961 $135 relay desktop

Was it the Heathkit EC-1?

Almost! The EC-1, introduced in 1959, was a small inexpensive desktop
computer. It was available as a kit for under $200! But it wasn’t
digital. It was analog, and could be used to solve certain types of problems,
but it’s not what most people think of as a computer today.
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Heathkit EC-1 1959 $199 analog tubes desktop

Was it the GENIAC?

So close! The GENIAC, designed by Edmund C. Berkeley in 1955, and sold by both
Berkeley Enterprises and several distributors
was small, affordable, digital, and user-programmable. It
couldn’t do much, but you can’t get much more personal than the GENIAC.

Thomas Haddock calls the GENIAC the first personal computer in his “Collector’s Guide…”.

The GENIAC was the first of several similar machines designed and sold by Berkeley:

  • Geniac = Genius Almost-Automatic Computer
  • Tyniac = Tiny Almost-Automatic Computer
  • Weeniac = Weeny Almost-Automatic Computer (only 60 made)
  • Brainiac = Brain-Imitating Almost-Automatic Computer

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Berkeley Enterprises GENIAC 1955 $19.95 electric rotary switches single-board

Was it Simon?

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Berkeley Enterprises Simon 1950 about $300 relay desktop

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