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Programming the Z80 is a seminal computer programming text, written by Rodnay Zaks and first published in 1979 by Sybex. It is designed as both an educational text to teach programming techniques of elementary to intermediate level using assembly language , and as a self-contained reference book.
In computing, the instruction register (IR) or current instruction register (CIR) is the part of a CPU's control unit that holds the instruction currently being executed or decoded. [1]
The IC is capable of interpreting and executing program instructions and performing arithmetic operations. [1] The microprocessor is a multipurpose, clock-driven, register-based, digital integrated circuit that accepts binary data as input, processes it according to instructions stored in its memory, and provides results (also in binary form ...
The program counter is typically set to a hard coded value when the CPU is first powered on, and will hence execute whatever machine code happens to be at this address. Similarly, the program counter can be set to execute whatever machine code is at some arbitrary address, even if this is not valid machine code.
The advantage over a hard-wired CPU is that internal CPU control becomes a specialized form of a computer program. Microcode thus transforms a complex electronic design challenge (the control of a CPU) into a less complex programming challenge. To take advantage of this, a CPU is divided into several parts:
The program counter (PC), [1] commonly called the instruction pointer (IP) in Intel x86 and Itanium microprocessors, and sometimes called the instruction address register (IAR), [2] [1] the instruction counter, [3] or just part of the instruction sequencer, [4] is a processor register that indicates where a computer is in its program sequence.
An instruction set simulator (ISS) is a simulation model, usually coded in a high-level programming language, which mimics the behavior of a mainframe or microprocessor by "reading" instructions and maintaining internal variables which represent the processor's registers.
IC programming [1] is the process of transferring a software or firmware into an integrated circuit (IC), typically to enable the chip to perform specific tasks or functions. The process of IC programming usually requires an IC programmer, also known as a chip programmer, device programmer, or PROM writer, which is an electronic device used to ...