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The 6501 is an eight-bit microprocessor
Microprocessor

A microprocessor incorporates most or all of the functions of a central processing unit on a single integrated circuit . The first microprocessors emerged in the early 1970s and were used for electronic calculators, using Binary-coded decimal arithmetic on 4-bit Word ....
, the first sold by MOS Technology
MOS Technology

MOS Technology, Inc., also known as CSG , was a integrated circuit design and Semiconductor device fabrication company based in Norristown, Pennsylvania, in the United States....
. The 6501 is the first member of the 65xx series
MOS Technology 65xx

MOS Technology 65xx is a family of 8-bit microprocessors from MOS Technology, based on the Motorola Motorola 6800 . The 65xx family most notably included the MOS Technology 6502, used in several home computers such as the Commodore PET and Commodore VIC-20, the Apple II family, and the Atari 8-bit family....
 of microprocessors. It was the first microprocessor to be sold for $25 in unit quantities. It was created by several ex-members of Motorola's design team and was pin-compatible with the Motorola 6800
Motorola 6800

The 6800 is an 8-bit microprocessor produced by Motorola and released shortly after the Intel 8080 in late 1974. It had 78 instructions, including the famous, undocumented Halt and Catch Fire bus test instruction....
 microprocessor. It was not software-compatible, offering several addressing modes not available on the 6800.

The 6502
MOS Technology 6502

The MOS Technology 6502 is an 8-bit microprocessor that was designed by Chuck Peddle and Bill Mensch for MOS Technology in 1975. When it was introduced, it was the least expensive full-featured central processing unit on the market by a considerable margin, costing less than one-sixth the price of competing designs from larger companies such...
 is a 6501 with the pins re-arranged following a lawsuit by Motorola over the 6501's pin arrangement.






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The 6501 is an eight-bit microprocessor
Microprocessor

A microprocessor incorporates most or all of the functions of a central processing unit on a single integrated circuit . The first microprocessors emerged in the early 1970s and were used for electronic calculators, using Binary-coded decimal arithmetic on 4-bit Word ....
, the first sold by MOS Technology
MOS Technology

MOS Technology, Inc., also known as CSG , was a integrated circuit design and Semiconductor device fabrication company based in Norristown, Pennsylvania, in the United States....
. The 6501 is the first member of the 65xx series
MOS Technology 65xx

MOS Technology 65xx is a family of 8-bit microprocessors from MOS Technology, based on the Motorola Motorola 6800 . The 65xx family most notably included the MOS Technology 6502, used in several home computers such as the Commodore PET and Commodore VIC-20, the Apple II family, and the Atari 8-bit family....
 of microprocessors. It was the first microprocessor to be sold for $25 in unit quantities. It was created by several ex-members of Motorola's design team and was pin-compatible with the Motorola 6800
Motorola 6800

The 6800 is an 8-bit microprocessor produced by Motorola and released shortly after the Intel 8080 in late 1974. It had 78 instructions, including the famous, undocumented Halt and Catch Fire bus test instruction....
 microprocessor. It was not software-compatible, offering several addressing modes not available on the 6800.

The 6502
MOS Technology 6502

The MOS Technology 6502 is an 8-bit microprocessor that was designed by Chuck Peddle and Bill Mensch for MOS Technology in 1975. When it was introduced, it was the least expensive full-featured central processing unit on the market by a considerable margin, costing less than one-sixth the price of competing designs from larger companies such...
 is a 6501 with the pins re-arranged following a lawsuit by Motorola over the 6501's pin arrangement. As a result of the lawsuit, MOS was forced to pay the legal costs and promise to destroy every 6501 they had manufactured. The 6502 also added a two-phase clock generator, so it only needed a single phase clock input, simplifying system design.