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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.
The machine included the Zilog Z80 and various bus features needed to run the CP/M operating system; a port of CP/M was done by the four-man software team at Exidy led by Vic Tolomei, in consultation with Digital Research. The "closed" case featured a built-in keyboard similar to later machines like the Commodore 64, and the Atari 8-bit ...
The Z80 CPU was used in the Sinclair ZX80, ZX81, ZX Spectrum and the Amstrad CPC home computers as well as the MSX architecture and the Microbee and Tandy TRS-80 (models I, II, III, 4, and others). The CP/M-80 operating system (and its huge software library featuring hits like WordStar and dBase ) was known to be the Z80 disk operating system ...
The Auxiliary Carry flag is set (to 1) if during an "add" operation there is a carry from the low nibble (lowest four bits) to the high nibble (upper four bits), or a borrow from the high nibble to the low nibble, in the low-order 8-bit portion, during a subtraction. Otherwise, if no such carry or borrow occurs, the flag is cleared or "reset ...
The Z-1 came with 8K of static RAM and used the same chassis as the IMSAI 8080 but featured the Z80 microprocessor rather than the IMSAI computer's Intel 8080 chip. [18] The Z-1 was succeeded by the Z-2 in June 1977, which featured 64K of RAM [19] and the ability to run Cromemco DOS (CDOS), a CP/M-like operating system. [20]
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The Zenith Z-89 is based on the Zilog Z80 microprocessor running at 2.048 MHz, and supports the HDOS and CP/M operating systems. The US$2295 Z-89 is integrated in a terminal-like enclosure with a non-detachable keyboard, 12-inch monochrome CRT with a 80x25 character screen, 48 KB RAM, and a 5.25" floppy disk drive.
The Sord M5 is a home computer launched by Sord Computer Corporation in 1982. [1] [2] [3] Primarily the Sord M5 competed in the Japanese home computer market.It was also sold as the CGL M5 in the United Kingdom by Computer Games Limited and was reasonably popular in Czechoslovakia, where the M5 stood as one of the first affordable computers available to the general public. [4]