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・ zettabyte
・ zeus
・ zf expression
・ zfc
・ zif
・ zigamorph
・ zil
・ zilog
・ zilog z280
・ zilog z8
zilog z80
・ zilog z8000
・ zilog z80000
・ zilog z80a
・ zip
・ zip disc
・ zip disk
・ zip drive
・ zip file
・ zip function


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zilog z80 : FOLDOC
Zilog Z80
An 8-bit microprocessor. It was released in July 1976 with a 2.5 MHz clock rate. The Z80 was a much improved Intel 8080 (as was the Intel 8085). It also used 8-bit data and 16-bit addressing, and could execute all of the 8080 operation code as well as 80 new ones, instructions that included 1, 4, 8 and 16-bit operations and even block move and block I/O instructions. The register set was doubled, with two banks of registers (including A and F) that could be switched between. This allowed fast operating system or interrupt context switches. It features 3 types of interrupt mode.
The Z80 also added two index registers (IX and IY) and relocatable {vectored interrupts} (via the 8-bit IV register). Like many processors (including the {8085}), the Z80 featured many undocumented op codes. Chip area near the edge was used for added instructions, but fabrication made the failure of these high. Instructions that often fail


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