MOS Technology 6510

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MOS Technology 6510

The MOS Technology 6510 is a 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, Inc.

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 is a modified form of the very successful 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...
.

The primary change from the 6502 was the addition of an 8-bit general purpose I/O

Input/output

In computing, input/output, or I/O, refers to the communication between an information processing system , and the outside world ? possibly a human, or another information processing system....
port (only six I/O pins were available in the most common version of the 6510).

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Encyclopedia

The MOS Technology 6510 is a microprocessor

Microprocessor

MOS Technology

MOS Technology 6502

Input/output

Three-state logic

In digital electronics three-state, tri-state, or 3-state logic gate allows output ports to have a value of logical 0, 1, or Hi-Z. A Hi-Z output puts the pin in a high impedance state, effectively removing the pin from its influence on the circuit....
.

The 6510 was only widely 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...
home computer

Home computer

A home computer was a class of personal computer entering the market in 1977 and becoming common during the 1980s. They were marketed to consumers as accessible personal computers, more capable than video game consoles....
(and in significantly smaller numbers in the C64's portable

Portable computer

A portable computer is a computer that is designed to be moved from one place to another and includes a display and keyboard. Portable computers, by their nature, are microcomputers....
version, the SX-64

Commodore SX-64

The Commodore SX-64, also known as the Executive 64, or VIP-64 in Europe, was a portable, briefcase/suitcase-size "luggable" version of the popular Commodore 64 home computer and holds the distinction of being the first full-color portable computer....
). In both the C64 and SX-64 the extra pins of the processor were used to control the computer's memory map

Memory map

In computer science, a memory map is a structure of data that indicates how Main memory is laid out. It contains the information regarding the size of total memory, and may also provide other details specific to the architecture....
, and in the C64 also for controlling the electric motor

Electric motor

An electric motor uses electrical energy to produce mechanical energy, nearly always by the interaction of magnetic fields and current-carrying conductors....
of the Datassette

Datassette

The Commodore 1530 Datasette , was Commodore International's dedicated computer tape recorder.It provided access to an inexpensive secondary storage for Commodore's 8-bit home computers, notably the Commodore PET, Commodore VIC-20, and Commodore 64....
tape recorder. It was possible, by writing the correct bit pattern to the processor at address $01, to completely expose the full 64KB

Kilobyte

Kilobyte is a unit of Computer data storage equal to either 1,024 bytes or 1,000 bytes , depending on context.It is abbreviated in a number of ways: KB, kB, K and Kbyte....
of RAM

Ram

Ram, ram, or RAM as a non-acronymic wordAs a non-acronymic word Ram, ram, or RAM may refer to:...
in the C64, leaving no ROM

Read-only memory

Read-only memory is a class of computer storage media used in computers and other electronic devices. Because data stored in ROM cannot be modified , it is mainly used to distribute firmware ....
or I/O

I/O

I/O may refer to:* Input/output, a system of communication for information processing systems* The input-output model, an economic model of flow prediction between sectors...
hardware exposed.

Variants

In 1985 MOS produced the 8500, an HMOS

HMOS

HMOS, high-performance n-channel metal-oxide-semiconductor, also called depletion-load NMOS, is a digital circuit logic family which uses n-type MOSFETs to implement logic gates....
version of the 6510. Other than the process change, it is virtually identical to the NMOS

NMOS

nMOS can refer to:* n-channel MOSFET* NMOS logic...
version of the 6510. The 8500 was originally designed for use in the modernised C64, the C64C. However in 1985, limited quantities of 8500s were found on older NMOS based C64s. It finally made its official debut in 1987, appearing in a motherboard using the new 85xx HMOS chipset.

The 7501/8501 variant of the 6510 was used in Commodore's C16, C116 and Plus/4 home computers, and the 2 MHz-capable 8502

MOS Technology 8502

The MOS Technology 8502 was an 8-bit microprocessor designed by MOS Technology and used in the Commodore 128. Based on the MOS Technology 6510 that was used in the Commodore 64, the 8502 added the ability to run at a double clock rate, in addition to the standard 1.024 MHz rate used by the Commodore 64....
variant was used in the Commodore C128. All these CPUs are opcode

Opcode

In computer technology, an opcode is the portion of a machine language instruction that specifies the operation to be performed. Their specification and format are laid out in the instruction set architecture of the processor in question ....
compatible (including undocumented opcodes

Illegal opcode

An Illegal Opcode, also called an Undocumented Instruction, is an instruction to a CPU that is not mentioned in any official documentation released by the CPU's designer or manufacturer, which nevertheless has an effect....
), except the 8502, where some differences concerning the undocumented opcodes have been reported.

The Commodore 1551

Commodore 1551

The Commodore 1551 was a floppy disk drive for the Commodore Plus/4 home computer. It resembled a charcoal-colored Commodore 1541 and plugged into the cartridge port, providing faster access than the Commodore 64/1541 combination....
disk drive used the 6510T, a version of the 6510 with eight I/O lines. The NMI

Non-Maskable interrupt

A non-maskable interrupt is a computer Central processing unit interrupt that cannot be ignored by standard interrupt masking techniques in the system....
and RDY signals are not available.

MOS Technology 6510

Variants

External links