Analysis of information sources in references of the Wikipedia article "Zilog Z80" in English language version.
[...] The 8086 is software-compatible with the 8080 at the assembly-language level. [...]
Undocumented Z80 codes allow 8 bit operations with IX and IY registers.
ADD A, n Add accumulator with immediate data n. MEMORY Timing: 2 M cycles; 7 T states.
Rabbit Semiconductor's Rabbit 3000 microprocessor, which is a much improved and enhanced derivative of ZiLOG, Inc.'s venerable Z80 microprocessor.
The Rabbit parts are based closely on the Zilog Z180 architecture, although they are not binary compatible with the Zilog parts.
and CP/M continued to dominate the 8-bit world of microcomputers.
The idea of a generic operating system is still in its infancy. In many ways it begins with CP/M and the mishmash of early 8080 and Z80 computers.
Most MZ's use the 8bit CPU LH0080 / Z80 [...]
The designers picked an architecture compatible with the Z80, giving Z80 users a completely software compatible upgrade path. The 64180 processor runs every Z80 instruction exactly as a Z80 does
It has a language of 252 root instructions and with the reserved 4 bytes as prefixes, accesses an additional 308 instructions.
If an opcode works with the registers HL, H or L then if that opcode is preceded by #DD (or #FD) it works on IX, IXH or IXL (or IY, IYH, IYL), with some exceptions. The exceptions are instructions like LD H,IXH and LD L,IYH.
The I/O instructions use the whole of the address bus, not just the lower 8 bits. So in fact, you can have 65536 I/O ports in a Z80 system (the Spectrum uses this). IN r,(C), OUT (C),r and all the I/O block instructions put the whole of BC on the address bus. IN A,(n) and OUT (n),A put A*256+n on the address bus.
Most MZ's use the 8bit CPU LH0080 / Z80 [...]
The idea of a generic operating system is still in its infancy. In many ways it begins with CP/M and the mishmash of early 8080 and Z80 computers.
The idea of a generic operating system is still in its infancy. In many ways it begins with CP/M and the mishmash of early 8080 and Z80 computers.
The designers picked an architecture compatible with the Z80, giving Z80 users a completely software compatible upgrade path. The 64180 processor runs every Z80 instruction exactly as a Z80 does
It has a language of 252 root instructions and with the reserved 4 bytes as prefixes, accesses an additional 308 instructions.
If an opcode works with the registers HL, H or L then if that opcode is preceded by #DD (or #FD) it works on IX, IXH or IXL (or IY, IYH, IYL), with some exceptions. The exceptions are instructions like LD H,IXH and LD L,IYH.
The I/O instructions use the whole of the address bus, not just the lower 8 bits. So in fact, you can have 65536 I/O ports in a Z80 system (the Spectrum uses this). IN r,(C), OUT (C),r and all the I/O block instructions put the whole of BC on the address bus. IN A,(n) and OUT (n),A put A*256+n on the address bus.
The 64180 is a Hitachi-supplied Z80 core with numerous on-chip "extras". Zilog's version is the Z180, which is essentially the same part.
Both Toshiba and Zilog sell the 84013 and 84015, which are Z80 cores with conventional Z80 peripherals integrated on-board.
