All Topics  
MOS Technology 8502

 
MOS Technology 8502

 
   Email Print
   Bookmark   Link
 

 

MOS Technology 8502
 
 
  Topics MOS Technology 8502 Topic Home

The MOS Technology 8502 was an 8-bit
8-bit

Eight-bit CPUs normally use an 8-bit data bus and a 16-bit address bus which means that their address space is limited to 64 KBs. This is not a "natural law", however, so there are exceptions....
 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 ....
 designed 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....
 and used in the Commodore 128
Commodore 128

The Commodore 128 home computer/personal computer was the last 8-bit machine commercially released by Commodore International . Introduced in January of 1985 at the Consumer Electronics Show in Las Vegas metropolitan area, it appeared three years after its predecessor, the bestselling Commodore 64....
. Based on the MOS 6510
MOS Technology 6510

The MOS Technology 6510 is a microprocessor designed by MOS Technology, and is a modified form of the very successful MOS Technology 6502.The primary change from the 6502 was the addition of an 8-bit general purpose input/output port ....
 that was used in the Commodore 64
Commodore 64

The Commodore 64 is an 8-bit home computer released by Commodore International in August, 1982, at a price of United States dollar595. Preceded by the Commodore VIC-20 and Commodore MAX Machine, the C64 features 64 kilobytes of Random-access memory with sound and graphics performance that were superior to IBM-compatible computers of tha...
, the 8502 added the ability to run at a double (2.048 MHz) clock rate, in addition to the standard 1.024 MHz rate used by the Commodore 64.

Since the 40-column VIC-II
MOS Technology VIC-II

The VIC-II , specifically known as the MOS Technology 6567/8562/8564 , 6569/8565/8566 , is the integrated circuit tasked with generating S-Video/composite video graphics and dynamic random access memory memory refresh signals in the Commodore 64 and Commodore 128 home computers....
 display chip
Graphics processing unit

A graphics processing unit or GPU is a dedicated graphics rendering device for a personal computer, workstation, or game console. Modern GPUs are very efficient at manipulating and displaying computer graphics, and their highly parallel structure makes them more effective than general-purpose Central processing unit for a range of com...
 could not "steal" sufficient cycles when the CPU ran at double speed, video display in fast mode was available only with the 80-column VDC.






Discussion
Ask a question about 'MOS Technology 8502'
Start a new discussion about 'MOS Technology 8502'
Answer questions from other users
Full Discussion Forum



Encyclopedia


Mos 8502r0 3686 Top
The MOS Technology 8502 was an 8-bit
8-bit

Eight-bit CPUs normally use an 8-bit data bus and a 16-bit address bus which means that their address space is limited to 64 KBs. This is not a "natural law", however, so there are exceptions....
 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 ....
 designed 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....
 and used in the Commodore 128
Commodore 128

The Commodore 128 home computer/personal computer was the last 8-bit machine commercially released by Commodore International . Introduced in January of 1985 at the Consumer Electronics Show in Las Vegas metropolitan area, it appeared three years after its predecessor, the bestselling Commodore 64....
. Based on the MOS 6510
MOS Technology 6510

The MOS Technology 6510 is a microprocessor designed by MOS Technology, and is a modified form of the very successful MOS Technology 6502.The primary change from the 6502 was the addition of an 8-bit general purpose input/output port ....
 that was used in the Commodore 64
Commodore 64

The Commodore 64 is an 8-bit home computer released by Commodore International in August, 1982, at a price of United States dollar595. Preceded by the Commodore VIC-20 and Commodore MAX Machine, the C64 features 64 kilobytes of Random-access memory with sound and graphics performance that were superior to IBM-compatible computers of tha...
, the 8502 added the ability to run at a double (2.048 MHz) clock rate, in addition to the standard 1.024 MHz rate used by the Commodore 64.

Since the 40-column VIC-II
MOS Technology VIC-II

The VIC-II , specifically known as the MOS Technology 6567/8562/8564 , 6569/8565/8566 , is the integrated circuit tasked with generating S-Video/composite video graphics and dynamic random access memory memory refresh signals in the Commodore 64 and Commodore 128 home computers....
 display chip
Graphics processing unit

A graphics processing unit or GPU is a dedicated graphics rendering device for a personal computer, workstation, or game console. Modern GPUs are very efficient at manipulating and displaying computer graphics, and their highly parallel structure makes them more effective than general-purpose Central processing unit for a range of com...
 could not "steal" sufficient cycles when the CPU ran at double speed, video display in fast mode was available only with the 80-column VDC. Some 40-column applications selectively disabled the screen when performing CPU-intensive calculations so that the additional speed could be utilized when the loss of video output was unimportant.

The pinout is a little bit different from the 6510. The 8502 has an extra I/O-pin and lacks the PHI2-pin that the 6510 had.

In 2007, HP released the HP 35s
HP 35s

The HP 35s Scientific Calculator is, as of 2007, the latest in Hewlett-Packard long line of non-graphing scientific_calculator and programmable calculators....
, a calculator that uses a 8502 microprocessor manufactured by Sunplus Technology.