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8-bit microprocessor from 1975
The MOS Technology 6502 is an 8-bit microprocessor that was designed by a small team led by Chuck Peddle for MOS Technology and was launched in September
MOS_Technology_6502
8-bit microprocessor
The MOS Technology 6510 is an 8-bit microprocessor designed by MOS Technology. It is a modified form of the very successful 6502. The 6510 is widely used
MOS_Technology_6510
Semiconductor company based in Pennsylvania, U.S.
MOS Technology, Inc. ("MOS" being short for Metal Oxide Semiconductor), later known as CSG (Commodore Semiconductor Group) and GMT Microelectronics, was
MOS_Technology
American company
the MOS Technology 6502 patent, Bill Mensch. Prior to leaving MOS Technology in 1977 Bill was the microprocessor design manager at MOS Technology. Beyond
Western_Design_Center
American electrical engineer (born 1945)
team led by Chuck Peddle that created the MOS Technology 6502. He also designed the 16-bit successor to the 6502, the 65816. Mensch is the founder, chairman
Bill_Mensch
CMOS microprocessor in the 6502 family
enhanced CMOS version of the popular nMOS-based 8-bit MOS Technology 6502. It uses less power than the original 6502, fixes several problems, and adds new
WDC_65C02
Home video game console
Motorola's new 6800 in future systems. In September 1975, MOS Technology debuted the 6502 microprocessor for $25 at the Wescon trade show in San Francisco
Atari_2600
Computer architecture bit width
Motorola 6800 were also used in similar computers. The Z80 and the MOS Technology 6502 8-bit CPUs were widely used in home computers and second- and third-generation
8-bit_computing
American electrical engineer (1937–2019)
as the main designer of the MOS Technology 6502 microprocessor and the Commodore PET personal computer, based on the 6502. Peddle was born in Bangor,
Chuck_Peddle
8/16-bit microprocessor
WDC 65C02 8-bit CPU, itself a CMOS enhancement of the venerable MOS Technology 6502 NMOS CPU. The 65C816 is the CPU for the Apple IIGS and, in modified
WDC_65C816
Computer model built by Apple
had to supply a case, power supply, and keyboard. Powered by the MOS Technology 6502 microprocessor, it was among the earliest personal computers to offer
Apple_I
8-bit microprocessor
significant improvements over it and 8-bit contemporaries like the MOS Technology 6502, including a hardware multiplication instruction, 16-bit arithmetic
Motorola_6809
Processor with instructions capable of multi-step operations
and Z8000 families; the National Semiconductor NS320xx family; the MOS Technology 6502 family; and others. Some designs have been regarded as borderline
Complex instruction set computer
Complex_instruction_set_computer
1978 US microcomputer
computer is a development computer introduced in 1978 based on the MOS Technology 6502 microprocessor. The AIM-65 is essentially an expanded KIM-1 computer
AIM-65
Small computer with a CPU made out of a microprocessor
the advent of increasingly powerful microprocessors such as the MOS Technology 6502, Zilog Z80, and Intel 8088. The predecessors to these computers,
Microcomputer
1976 briefcase computer
Vernon, New Hampshire, in late 1976. The computer was based on the MOS Technology 6502 microprocessor and came in a small enclosure that fit inside an attaché
Baby!_1
Amsterdam Compiler Kit (ACK) targets many architectures of the 1980s, including 6502, 6800, 680x0, ARM, x86, Zilog Z80 and Z8000. LLVM targets many platforms
Comparison_of_assemblers
CPU made by Ricoh for the Nintendo NES
3. The Ricoh 2A03 contains a derivative of the MOS Technology 6502 core, modified to disable the 6502's binary-coded decimal mode. It also integrates
Ricoh_2A03
Engineering flaw in a manufactured device
instructions, known as illegal opcodes, on the MOS Technology 6510 of the Commodore 64 and MOS Technology 6502 of the Apple II computers are sometimes utilized
Hardware_bug
Video/audio/input chip of the Atari 2600
(TIA) is the custom computer chip which, along with a variant of the MOS Technology 6502, constitutes the heart of the 1977 Atari Video Computer System game
Television_Interface_Adaptor
Memory page starting at address zero
dependent on machine architecture. For example, the Motorola 6800 and MOS Technology 6502 processor families treat the first 256 bytes of memory specially
Zero_page
8-bit central processing unit
MOS Technology 8502 is an 8-bit microprocessor designed by MOS Technology and used in the Commodore 128 (C128). It is an improved version of the MOS 6510
MOS_Technology_8502
Soviet personal computer series
of 8-bit computers produced in the Soviet Union. It used the same MOS Technology 6502 microprocessor as Apple II and BBC Micro, among many others. Commissioned
Agat_(computer)
1981 home computer
up as the customer required during chip manufacture. This short-lived technology of the day was cheaper and quicker than the design of a customised logic
ZX81
Home video game console
of the MOS Technology 6502, an 8-bit microprocessor prevalent in contemporary home computers and consoles. Nintendo ostensibly disabled the 6502's binary-coded
Nintendo_Entertainment_System
8-bit microprocessor
"six-five-oh-seven") is an 8-bit microprocessor from MOS Technology, Inc. It is a version of their 40-pin 6502 packaged in a 28-pin DIP, making it cheaper to
MOS_Technology_6507
Atari 8-bit computer programming language
8-bit computers. The language, similar to ALGOL, maps cleanly to the MOS Technology 6502 of the Atari computer without complex compiler optimizations. Fast
Action! (programming language)
Action!_(programming_language)
Monetary symbol used in many national currencies
assembly language (such as the Motorola 6800, Motorola 68000 and MOS Technology 6502 assembly languages), in Pascal and in Pascal-like languages such
Dollar_sign
Microprocessor made by Ricoh for the Super Nintendo Entertainment System
The CPU runs between 1.79 MHz and 3.58 MHz, and uses an extended MOS Technology 6502 instruction set. In addition to the 65C816 CPU core, the 5A22 contains
Ricoh_5A22
Merlin is a MOS Technology 6502 macro assembler developed by mathematics professor Glen Bredon for the Apple II under DOS 3.3. It was published commercially
Merlin_(assembler)
Binary to ASCII text format
and has been used to interchange files for computers based on the MOS Technology 6502 microprocessor. The open-source Srecord package simplified this tape
MOS_Technology_file_format
8-bit microprocessor
magazine's microprocessor editor, interviewed Chuck Peddle about MOS Technology's new 6502 microprocessor. Cushman then asked "Tom Bennett, master architect
Motorola_6800
8-bit desktop computer from the early 1980s
MOS Technology 6502 used as a graphics coprocessor. The Visual 1050 featured a dual-processor architecture; Z80A processor as the main CPU and a 6502
Visual_1050
Electronic circuit formed on a small, flat piece of semiconductor material
compatible (with the 8088/8086) 80286, 80386/i386, i486, etc. The MOS Technology 6502 and Zilog Z80 microprocessors, used in many home computers of the
Integrated_circuit
8-bit microprocessor
WDC 65C02 CPU, an upgraded CMOS version of the popular NMOS-based MOS Technology 6502 8-bit CPU, manufactured for Hudson by Seiko Epson and NEC. The most
Hudson_Soft_HuC6280
Usage of mere clock rate to compare performance of microprocessors
processor had a clock speed roughly 4.7 times the clock speed of the MOS Technology 6502 used in the latter. However, what really matters is not how finely
Megahertz_myth
Unix type Operating System for 6502 processor
portal GeckOS is a multitasking operating system for MOS 6502, and compatible processors such as the MOS 6510. The GeckOS operating system is one of the few
GeckOS
8/16-bit microprocessor
by Commodore Semiconductor Group in 1988. It is a member of the MOS Technology 6502 family, developed from the CMOS WDC 65C02 released by the Western
CSG_65CE02
6502-based computer from Italy
"Sperimentare" began publishing a series of articles describing the MOS Technology 6502 machine. The original machine came with 1 kB of RAM and a monitor
Amico_2000
The MOS Technology 6509, an enhanced version of the popular 6502 microprocessor, is capable of addressing up to 1 megabyte of RAM via bank switching. While
MOS_Technology_6509
The 1540 is an "intelligent peripheral" in that it has its own MOS Technology 6502 CPU (just like its VIC-20 host) and the resident Commodore DOS on
Commodore_1540
2020 video game
by 6502 Workshop, a retrocomputing group headed by programmer Megan Lemmert. Programming was done in the assembly language of MOS Technology 6502, the
Nox_Archaist
Microprocessor I/O port controller IC
The MOS Technology 6522 Versatile Interface Adapter (VIA) is an integrated circuit that was designed and manufactured by MOS Technology as an I/O port
MOS_Technology_6522
Undocumented CPU instruction that has an effect
were common on older CPUs designed during the 1970s, such as the MOS Technology 6502, Intel 8086, and the Zilog Z80. Unlike modern processors, those older
Illegal_opcode
First model in the Apple II computer series
design was done by Steve Wozniak. The system is based around the MOS Technology 6502, an 8-bit microprocessor. Howard Cantin designed the printed circuit
Apple_II_(original)
Video microchip in the Commodore 64 and C128 home computers
The VIC-II (Video Interface Chip II), specifically known as the MOS Technology 6567/6566/8562/8564 (NTSC versions), 6569/8565/8566 (PAL), is the microchip
MOS_Technology_VIC-II
very similar to computers that inspired it: Specifications: CPU: MOS Technology 6502 ROM: 16 KB (with modified Microsoft BASIC interpreter and Machine
Galeb_(computer)
Integrated circuit
Adapter (CIA) was an integrated circuit made by MOS Technology. It served as an I/O port controller for the 6502 family of microprocessors, providing for parallel
MOS_Technology_CIA
Single-board computer produced by MOS Technology in 1976
for Keyboard Input Monitor, is a small 6502-based single-board computer developed and produced by MOS Technology, Inc. and launched in 1976. It was very
KIM-1
Integrated circuit made by MOS Technology
(ACIA) is an integrated circuit made by MOS Technology. It served as a companion UART chip for the widely popular 6502 microprocessor. Intended to implement
MOS_Technology_6551
Floppy disk drive for the Commodore 64
The disk drive uses group coded recording (GCR) and contains a MOS Technology 6502 microprocessor, doubling as a disk controller and on-board disk operating
Commodore_1541
Family of RISC-based computer architectures
December 1981. This was a relatively conventional machine based on the MOS Technology 6502 CPU but ran at roughly double the performance of competing designs
ARM_architecture_family
Programmable machine that processes data
transistors (1940s), MOSFET (MOS transistors 1950s), and finally monolithic integrated circuits (1950s+). With each technology advancement resulting in smaller
Computer
BBC Micro expansion interface
developed for the Tube. Most commonly seen was the 6502 Second Processor, featuring a MOS Technology 6502 processor, which allowed unmodified BBC Micro programs
Tube_(BBC_Micro)
including the Motorola 6800 (1974), the Fairchild F8 (1974), the MOS Technology 6502 (1975) and the National Semiconductor SC/MP (1976). Federico Faggin
History_of_personal_computers
Taiwanese semiconductor foundry
networking, with a targeted 2027 start for production. UM6502 a MOS Technology 6502 second source UMC UM62256EM-70LL - 32 kbit CMOS SRAM UMC Green CPU
United Microelectronics Corporation
United_Microelectronics_Corporation
Class of microcomputers
the dominant microprocessors used in home computers were the 8-bit MOS Technology 6502 (Apple, Commodore, Atari, BBC Micro) and Zilog Z80 (TRS-80, ZX81
Home_computer
Order of bytes in a computer word
and its x86 successors, including IA-32 and x86-64 processors. The MOS Technology 6502 family (including Western Design Center 65802 and 65C816), the Zilog
Endianness
Programming language family
InterLisp-D. A small version called "InterLISP 65" was published for the MOS Technology 6502-based Atari 8-bit computers. Maclisp and InterLisp were strong competitors
Lisp_(programming_language)
1977–1993 series of microcomputers
The first Apple II computers went on sale on June 10, 1977, with a MOS Technology 6502 (later Synertek) microprocessor running at 1.023 MHz, 4 KB of RAM
Apple_II
Visual representation of all opcodes in an instruction set
cycle counts. This is the opcode table for the MOS Technology 6502 microprocessor from 1975. The 6502 uses 8-bit opcodes. Of the 256 possible opcodes
Opcode_table
Natural number
computers with processors having a 16-bit address bus such as the MOS Technology 6502 popular in the 1970s and the Zilog Z80, 65535 (FFFF16) is the highest
65,535
British computer manufacturer
National Semiconductor SC/MP microprocessor, but soon the switch to a MOS Technology 6502 was made. CPU had financed the development of a SC/MP based microcomputer
Acorn_Computers
Apple II clone introduced in 1982 by Multitech
controller). Micro-Professor II had the following specifications: CPU: MOS Technology 6502 Clock rate: 1 MHz RAM: 64 KB (including 16KB RAM mapped at the same
Microprofessor_II
Chess Computer
models used different 8-bit, 16-bit and 32-bit processors, including MOS Technology 6502, Motorola 68HC05, Motorola 68000 and others. Hegener & Glaser and
Mephisto_(chess_computer)
Older computer system
microprocessors. The earliest Apple Inc. personal computers, using the MOS Technology 6502 processors, are among some of the most collectible. They are relatively
Vintage_computer
Bug in the Intel P5 Pentium floating-point unit
found. Floating-point arithmetic § Accuracy problems MaverickCrunch MOS Technology 6502 § Bugs and quirks Pentium F00F bug Edelman, Alan (January 1, 1997)
Pentium_FDIV_bug
Video game console
into the games themselves with the more basic games using the same 8-bit 6502 CPU as the NES. More advanced games were released using the 16-bit 65816
Xavix
American telecommunications company (1928–2011)
video game applications. The 6800 is the basis for the more popular MOS Technology 6502 which was made by former Motorola employees. That year, Motorola
Motorola
Microprocessor
such as the Zilog Z80, and less expensive designs, such as the MOS Technology 6502. By late 1976 sales were stagnant and the division was saved by a
Motorola_68000
Defunct homebrew computing project
boards for other CPUs, including the Zilog Z180, the Intel 80188, the MOS Technology 6502, and the Motorola 6809, 68000 and 68030. The N8VEM boards were designed
N8VEM
Computer processor contained on an integrated-circuit chip
August 1974, and the similar MOS Technology 6502 was released in 1975 (both designed largely by the same people). The 6502 family rivaled the Z80 in popularity
Microprocessor
8-bit microprocessor
The MOS Technology 6508 is an 8-bit microprocessor designed by MOS Technology. Based on the popular 6502, the 6508 is augmented with two additional features:
MOS_Technology_6508
Home video game console
system to become successful. Bill Mensch, the co-creator of the 8-bit MOS Technology 6502 microprocessor and founder of the Western Design Center (WDC), gave
Super Nintendo Entertainment System
Super_Nintendo_Entertainment_System
Computer (Famicom) Nintendo (Japan) 61.91 million Ricoh 2A03 processor (MOS Technology 6502 core) @1.79 MHz 8-bit PV-1000 October 1983 Casio (Japan) ? Z80A clocked
List of home video game consoles
List_of_home_video_game_consoles
Photo or recording of the layout of an integrated circuit
Microcontroller Die shot of Hitachi HD61914 SRAM Die shot of the MOS Technology 6502 Die shot of a Motorola 68040-microprocessor Die shot of a Matrox
Die_shot
The 65xx family of microprocessors, consisting of the MOS Technology 6502 and its derivatives, the WDC 65C02, WDC 65C802 and WDC 65C816, and CSG 65CE02
Interrupts_in_65xx_processors
early dynamic random-access memory (DRAM) chip launched in 1970. MOS Technology 6502 1 MHz CPU launched in 1975. Toshiba TLCS-12, a microprocessor developed
List of semiconductor scale examples
List_of_semiconductor_scale_examples
worked as a programmer using microprocessors such as the RCA 1802 and MOS Technology 6502, as well as platforms like the Commodore 64, programming in languages
Tim_Pritlove
American academic
interpreters were available for the Intel 8080, the Motorola 6800 and MOS Technology 6502 processors. This was a forerunner of the free software community's
Dennis_Allison
1982 video game
— David Thiel on the creation of Q*bert's incoherent swearing. A MOS Technology 6502 chip that operates at 894 kHz generates the sound effects, and a
Q*bert
Custom digital electronics used to interface simple integrated circuits
Address decoding circuitry used with older processors like the MOS Technology 6502 or Zilog Z80 to divide up the processor's address space into RAM
Glue_logic
Apple IIe clone introduced in 1983 by Multitech
It was also sold in Latin America as the Latindata MPF-III. CPU: MOS Technology 6502, 1 MHz Memory (RAM): 64KB dynamic RAM and 2KB static RAM ROM: 24KB
Microprofessor_III
Futurama character
that Bender's head contains a device clearly marked "6502" (a designation for MOS Technology 6502, an eight-bit microprocessor used in the original Apple
Bender_(Futurama)
Dialect of the Lisp programming language
setting starts used for the platform. Also in 1981, a variant for the MOS Technology 6502 processor, INTER-LISP/65, was released by Datasoft for the Atari
Interlisp
8-bit CMOS microcontrollers and microprocessors with an enhanced MOS Technology 6502 compatible core based on the expanded WDC 65C02. The ICs were manufactured
Mitsubishi_740
1979 computer spreadsheet application
port the program to other computers, starting with those with the MOS Technology 6502 microprocessor, and versions appeared for Atari 8-bit computers and
VisiCalc
Personal computer system
by Commodore International. A single all-in-one case combines a MOS Technology 6502 microprocessor, Commodore BASIC in read-only memory, keyboard, monochrome
Commodore_PET
Model that describes the programmable interface of a computer processor
for some kind of system call or software interrupt. For example, MOS Technology 6502 uses 00H, Zilog Z80 uses the eight codes C7,CF,D7,DF,E7,EF,F7,FFH
Instruction_set_architecture
Canadian computer scientist
Media Lab. Silverman was part of a team that reverse-engineered the MOS Technology 6502 and Intel 4004 microprocessors and developed transistor-level emulators
Brian_Silverman
Reference to a specific memory location
their word size. For instance, many 8-bit processors, such as the MOS Technology 6502, supported 16-bit addresses— if not, they would have been limited
Memory_address
Layer of hardware-level instructions or data structures
(without much, or any, microcode) do most of the sequencing. The MOS Technology 6502 is an example of a microprocessor using a PLA for instruction decode
Microcode
Brazilian Apple II Plus clone made in 1984 by Microdigital Electrônica
TK2000/II was released and in 1987 the machine was discontinued. CPU - MOS Technology 6502 at 1,02 MHz Memory - 16 KB ROM, 64 KB RAM (expandable to 128KB) Sound
TK_2000
Early microprocessor
take three machine cycles (24 clock cycles). By comparison, the MOS Technology 6502 takes two to seven clock cycles to execute an instruction and the
RCA_1802
Commodore floppy disk drive
and other users. Like the 1541 and 1571, the 1581 has an onboard MOS Technology 6502 CPU with its own ROM and RAM, and uses a serial version of the IEEE-488
Commodore_1581
1979–1991 home computer series
400 and Atari 800. The architecture is designed around the 8-bit MOS Technology 6502 CPU and three custom coprocessors which provide support for sprites
Atari_8-bit_computers
16-bit microprocessor
years are Motorola 6800 (1974), General Instrument PIC16X (1975), MOS Technology 6502 (1975), Zilog Z80 (1976), and Motorola 6809 (1978). The development
Intel_8086
Acorn Computers home computer, 1980–1982
cost option to the BBC Micro. The Atom was a progression of the MOS Technology 6502-based machines that the company had been making from 1979. The Atom
Acorn_Atom
Incorporated p. 4/3, A history of the personal computer: the people and the technology, Roy A. Allan, 2001, ISBN 0-9689108-0-7. "Intel SIM4-01". www.oldcomputermuseum
List_of_early_microcomputers
Computer machine code instruction
model using his own x86 processor fuzzer called sandsifter. The NMOS MOS Technology 6502 has 12 invalid instructions which cause the program counter to fail
Halt and Catch Fire (computing)
Halt_and_Catch_Fire_(computing)
travel, tourism, insurance
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MOS TECHNOLOGY-6502
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