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Personal Computer Revolution (1970 (Microcomputers (Advance IC (low cost…
Personal Computer Revolution
1970
Microcomputers
Advance IC
low cost solid state memory
Magnetic tape cassette
Single-chip CPU
low cost display
Benefits of microcomputer
no time sharing
no muti user
"First" computer contenders
Kenback-1
MCM/70
"first" commercially successful personal computer
Altair 8800
1975
"first" commercially successful personal computer
~ -$439 price point
($2000 today)
-build-it-yourself kit
-extremely cheap in 1975
-interact using teletypeterminal
-use machine cod (low level language)
Bill Gates and Paul Allen
-Contacted MITS ( Making the Altair 8800)
-Program written in Basic,popular and simple programming language
-converted basic instructions called an interpreter
1.MITS interested (They do a demonstration)
2.Have a problem (cannot written the interpreteryet
3.Hacked together in just a few weeks
4.Finishing the final piece of code on the plane
success mits (altair basic) micro-soft
1977
known as trinity 1977
TRS-80 Model I
made by Tandy Coorperation and sold by Radioshack
less advance from Apple II but the cost is half from Apple II
Commodore PET 2001
computer, monitor, keyboard and tape drive connected
into one device
Apple II
sold as a complete system
rudimentary graphic and sound output
low cost
sold by millions
They all come with BASIC interpreter,allowing non-computer-wizards to create programs
May 1976, Steve Wozniak demonstrated his prototype
to the Club and shared the schematics with interested members
It was designed to connect to a TV and offered a text interface ‒ a first for a low-cost computer. Interest was high
It went on sale in July 1976 with a price tag of $666.66 . It was called the Apple 1, and it was Apple Computer’s first product.
Steve Jobs suggested that instead of just sharing the designs for free, that they should just sell an assembled motherboard.
Like the Altair 8800, the Apple 1 was sold
as a kit. It appealed to hobbyists, who didn’t mind
tinkering and soldering, but consumers and businesses weren’t interested
The killer app
the marketing of these computer rise which caught the attention of the biggest computer company,which is,IBM who had seen its share of the overall computer market shrink from 60% in 1970 to around 30% by 1980
In 1980,IBM’s least-expensive computer,
the 5120, cost roughly ten thousand dollars,which was never going to compete with the
likes of the Apple II.
1979’s VisiCalc, the first spreadsheet program – which was infinitely better than paper and the for bearer of programs like Microsoft Excel and Google Sheets.
1976
IBM
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