MOS Technology: Difference between revisions
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'''MOS Technology, Inc''' was a microprocessor manufacturing company most famous for its creation of the [[MOS Technology 6502|6502]] processor. | '''MOS Technology, Inc''' was a microprocessor manufacturing company most famous for its creation of the ubiquitous [[MOS Technology 6502|6502]] processor. | ||
The 6502 was used as the main [[CPU]] (Central Processing Unit) in many computers and game consoles during the late 1970s and early-to-mid-1980s. An incomplete list of machines that were built around the 6502 include: | The 6502 was used as the main [[CPU]] (Central Processing Unit) in many computers and game consoles during the late 1970s and early-to-mid-1980s. An incomplete list of machines that were built around the 6502 include: | ||
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The company's original target market and purpose was to provide a second source for Texas Instruments designed electronic calculators and the chips inside them. | The company's original target market and purpose was to provide a second source for Texas Instruments designed electronic calculators and the chips inside them. | ||
Fortunes for the company changed dramatically in 1975. A group of designers from the [[Motorola 6800]] team left the company in a mass exodus shortly after its release. "As Motorola publicly unveiled the 6800, Chuck Peddle and seven coworkers from the engineering and marketing department left Motorola to pursue their own vision. The team included Will Mathis, Bill Mensch, Rod Orgill, Ray Hirt, Harry Bawcum, Mike James and Terry Holt."<ref name="On the Edge">{{cite book | Fortunes for and the direction of the company changed dramatically in 1975. A group of designers from the [[Motorola 6800]] team left the company in a mass exodus shortly after its release. "As Motorola publicly unveiled the 6800, Chuck Peddle and seven coworkers from the engineering and marketing department left Motorola to pursue their own vision. The team included Will Mathis, Bill Mensch, Rod Orgill, Ray Hirt, Harry Bawcum, Mike James and Terry Holt."<ref name="On the Edge">{{cite book | ||
| author=Brian Bagnall | | author=Brian Bagnall | ||
| title='On the Edge: The Spectacular Rise and Fall of | | title='On the Edge: The Spectacular Rise and Fall of Commodore' | ||
| isbn=0-9738649-0-7 | | isbn=0-9738649-0-7 | ||
}}</ref> MOS was a small firm with good credentials in the right area, the East coast of the USA, and this was the luckiest windfall the company had yet received. | }}</ref> MOS was a small firm with good credentials in the right area, the East coast of the USA, and this was the luckiest windfall the company had yet received. | ||
At MOS the team set about building a new CPU that would outperform the 6800 while being similar to it in purpose. The resulting 6501 design was somewhat similar to the 6800, but by using several simplifications in the design, the 6501 would be up to four times faster.<ref name="MOS Tech 6502 microprocessor">{{cite web | At MOS the team set about building a new CPU that would outperform the 6800 while being similar to it in purpose. The resulting 6501 design was somewhat similar to the 6800, but by using several simplifications in the design, the 6501 would be up to four times faster.<ref name="MOS Tech 6502 microprocessor">{{cite web | ||
| url=http://mysite.verizon.net/rrucker/apple_30/laying_the_foundation/mos_tech_6502_microprocesso.html | |url=http://mysite.verizon.net/rrucker/apple_30/laying_the_foundation/mos_tech_6502_microprocesso.html | ||
| title="MOS Tech 6502 microprocessor" | | title="MOS Tech 6502 microprocessor" | ||
| date=Retreived 07-April-2007 | | date=Retreived 07-April-2007 | ||
Revision as of 09:04, 8 April 2007
MOS Technology, Inc was a microprocessor manufacturing company most famous for its creation of the ubiquitous 6502 processor.
The 6502 was used as the main CPU (Central Processing Unit) in many computers and game consoles during the late 1970s and early-to-mid-1980s. An incomplete list of machines that were built around the 6502 include:
Home Computers
Acorn Electron/BBC Microcomputer
Apple II
Commodore PET
Commodore VIC-20
Commodore 64
Game consoles
Atari 2600
Nintendo Entertainment System (or NES)
Company History
"In 1969, a large industrial manufacturing company named Allen-Bradley wanted to enter the new semiconductor business. They financed the creation of MOS Technology." The founders selected had also previously worked with Chuck Peddle at General Electric, and their names were Mort Jaffe, Don McLaughlin and John Pavinen.[1]
The company's original target market and purpose was to provide a second source for Texas Instruments designed electronic calculators and the chips inside them.
Fortunes for and the direction of the company changed dramatically in 1975. A group of designers from the Motorola 6800 team left the company in a mass exodus shortly after its release. "As Motorola publicly unveiled the 6800, Chuck Peddle and seven coworkers from the engineering and marketing department left Motorola to pursue their own vision. The team included Will Mathis, Bill Mensch, Rod Orgill, Ray Hirt, Harry Bawcum, Mike James and Terry Holt."[1] MOS was a small firm with good credentials in the right area, the East coast of the USA, and this was the luckiest windfall the company had yet received.
At MOS the team set about building a new CPU that would outperform the 6800 while being similar to it in purpose. The resulting 6501 design was somewhat similar to the 6800, but by using several simplifications in the design, the 6501 would be up to four times faster.[2]
Controversy
When the 6501 was released, Motorola filed suit against MOS almost immediately. The 6501 was pin compatible with Motorola's 6800 (meaning it could fit in the same board socket), however its instruction set was different. Nevertheless, MOS Technology changed the processor's design to avoid being sued. The 'lawsuit-friendly' 6502 (which was neither pin-compatible nor instruction-set compatible) was the result.[2]
See Also
References
- ↑ 1.0 1.1 Brian Bagnall. 'On the Edge: The Spectacular Rise and Fall of Commodore'. ISBN 0-9738649-0-7.
- ↑ 2.0 2.1 "MOS Tech 6502 microprocessor" (Retreived 07-April-2007).