Interrupts in 65xx processors and MOS Technology 6502

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Difference between Interrupts in 65xx processors and MOS Technology 6502

Interrupts in 65xx processors vs. MOS Technology 6502

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, all handle interrupts in a similar fashion. The MOS Technology 6502 (typically "sixty-five-oh-two" or "six-five-oh-two") William Mensch and the moderator both pronounce the 6502 microprocessor as "sixty-five-oh-two".

Accumulator (computing)

In a computer's central processing unit (CPU), an accumulator is a register in which intermediate arithmetic and logic results are stored.

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Address bus

An address bus is a computer bus (a series of lines connecting two or more devices) that is used to specify a physical address.

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Assembly language

An assembly (or assembler) language, often abbreviated asm, is a low-level programming language, in which there is a very strong (but often not one-to-one) correspondence between the assembly program statements and the architecture's machine code instructions.

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Binary-coded decimal

In computing and electronic systems, binary-coded decimal (BCD) is a class of binary encodings of decimal numbers where each decimal digit is represented by a fixed number of bits, usually four or eight.

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Byte (magazine)

Byte was an American microcomputer magazine, influential in the late 1970s and throughout the 1980s because of its wide-ranging editorial coverage.

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CMOS

Complementary metal–oxide–semiconductor, abbreviated as CMOS, is a technology for constructing integrated circuits.

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CSG 65CE02

The CSG 65CE02 is a 8/16-bit microprocessor developed by Commodore Semiconductor Group in 1988.

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Index register

An index register in a computer's CPU is a processor register used for modifying operand addresses during the run of a program, typically for doing vector/array operations.

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Interrupt

In system programming, an interrupt is a signal to the processor emitted by hardware or software indicating an event that needs immediate attention.

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Interrupt handler

In computer systems programming, an interrupt handler, also known as an interrupt service routine or ISR, is a special block of code associated with a specific interrupt condition.

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Machine code monitor

A machine code monitor (machine language monitor) is software that allows a user to enter commands to view and change memory locations on a computer, with options to load and save memory contents from/to secondary storage.

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McGraw-Hill Education

McGraw-Hill Education (MHE) is a learning science company and one of the "big three" educational publishers that provides customized educational content, software, and services for pre-K through postgraduate education.

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Microprocessor

A microprocessor is a computer processor that incorporates the functions of a central processing unit on a single integrated circuit (IC), or at most a few integrated circuits.

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MOS Technology

MOS Technology, Inc. ("MOS" being short for Metal Oxide Semiconductor), also known as CSG (Commodore Semiconductor Group), was a semiconductor design and fabrication company based in Norristown, Pennsylvania, in the United States.

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NMOS logic

N-type metal-oxide-semiconductor logic uses n-type field-effect transistors (MOSFETs) to implement logic gates and other digital circuits.

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Non-maskable interrupt

In computing, a non-maskable interrupt (NMI) is a hardware interrupt that standard interrupt-masking techniques in the system cannot ignore.

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NOP

In computer science, a NOP, no-op, or NOOP (pronounced "no op"; short for no operation) is an assembly language instruction, programming language statement, or computer protocol command that does nothing.

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Opcode

In computing, an opcode (abbreviated from operation code, also known as instruction syllable, instruction parcel or opstring) is the portion of a machine language instruction that specifies the operation to be performed.

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Program counter

The program counter (PC), commonly called the instruction pointer (IP) in Intel x86 and Itanium microprocessors, and sometimes called the instruction address register (IAR), the instruction counter, or just part of the instruction sequencer, is a processor register that indicates where a computer is in its program sequence.

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Stack (abstract data type)

In computer science, a stack is an abstract data type that serves as a collection of elements, with two principal operations.

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Status register

A status register, flag register, or condition code register (CCR) is a collection of status flag bits for a processor.

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WDC 65816/65802

The W65C816S (also 65C816 or 65816) is a 16-bit microprocessor (MPU) developed and sold by the Western Design Center (WDC).

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WDC 65C02

The Western Design Center (WDC) 65C02 microprocessor is an enhanced CMOS version of the popular NMOS-based 8-bit MOS Technology 6502 microprocessor—the CMOS redesign being made by Bill Mensch in 1978.

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Western Design Center

The Western Design Center (WDC), located in Mesa, Arizona, USA, is a company developing and manufacturing MOS 65xx-based microprocessors, microcontrollers (µCs), and related support devices.

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