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The Zilog Z80 is an 8-bit microprocessor designed by Zilog that played an important role in the evolution of early computing. Launched in 1976, it was designed to be software-compatible with the Intel 8080, offering a compelling alternative due to its better integration and increased performance.
Many instruction set architectures have instructions that, on some implementations of that instruction set architecture, operate on half and/or twice the size of the processor's major internal datapaths. Examples of this are the Z80, MC68000, and the IBM System/360. On these types of implementations, a twice as wide operation typically also ...
The HD64180 is a Z80-based embedded microprocessor developed by Hitachi with an integrated memory management unit (MMU) and on-chip peripherals. [1] It appeared in 1985. [ 2 ] The Hitachi HD64180 "Super Z80" was later licensed to Zilog and sold by them as the Z64180 and with some enhancements as the Zilog Z180 .
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.
The Z80(i) is an improved implementation of the Intel 8080 architecture, with substantial extensions to the register model and instruction set and with added hardware interface features. At introduction, the Z80 was faster, more capable, and much cheaper than the 8080.
When an instruction changes the program counter, it flushes the instructions that the CPU is currently processing. Available at up to 50 MHz (2004), the performance is comparable to a Z80 clocked at 150 MHz if fast memory is used (i.e. no wait states for opcode fetches, for data, or for I/O) or even higher in some applications (a 16-bit ...
The main processor offloaded the disk, tape, and serial I/O operations to a Z80 processor on a second board. [ 29 ] 1981: Zilog Systems Z-Lab 8000 Programmer's Development System, available as a Model 20 system with 256 KB of RAM and single 24 MB hard drive, priced at $27,000, or a Model 30 system with 512 KB of RAM and dual hard drives, priced ...
Shima moved to Zilog in 1975 and, using only a few assistants, [8] developed the transistor-level and physical implementation of the Zilog Z80, under the supervision of Faggin, who conceived and designed the Z80 architecture to be an instruction set compatible with the Intel 8080.