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  • How did the Z80 instruction set differ from the 8080?
    The Zilog Z80 microprocessor, known for its use in the ZX Spectrum, was designed to be a backwards-compatible extension to the Intel 8080 processor It introduced several new instructions to the 8080's instruction set, as well as adding or extending registers
  • Why did the Z80 with 4-bit ALU out-perform the fully 8-bit Intel 8080?
    Looking at the development and architecture of the Z80, it appears to be a scaled-down, cost-reduced (in terms of total system cost), clone of the Intel 8080 It only used a 4-bit ALU I assume this would have reduced its performance considerably However, the Z80 out performed the Intel version and nearly displaced it completely in the CP M
  • Comparing raw performance of the Z80 and the 6502
    It is said the Z80 has a typical 4 clock ticks per instruction, while the 6502 has typically 1 clock tick per instruction and a rudimentary pipeline It is said the Z80 ALU internally, is 4 bits when the 6502 ALU is 8 bits It is said the z80 accesses memory every 4 clock ticks, while the 6502 accesses memory every 2 clock ticks
  • Good Z80 disassembler decompiler on modern equipment?
    It is quite powerful, supports Z80, and is also free and open source The only obvious downside to it is that it is a several hundred Mb download, vs several megabytes of IDA free 3 7 Interestingly, 8 years ago a closely related question was asked over at Reverse Engineering StackExchange: "Is there any disassembler to rival IDA Pro?"
  • z80 - What is R register and DRAM refresh internal operation . . .
    The Z80 CPU has a built-in feature to support refreshing DRAM memory, by keeping a 7-bit refresh counter in the register R The refresh counter is increased by 1 after every instruction opcode fetch, and after the instruction opcode has been fetched and being decoded, the idle time on the bus is used to do a refresh bus cycle with the register
  • How do Z80 Block Transfer instructions work? - coco
    Comparing Z80 with 6809 we should take into account difference in first production date which leads to technology difference (feature size) and thus to difference in the number of transistors that were available to the designers, as well as the fact that Z80 traditionally has higher clock rates than 6502-likes and 6809-likes, thus making the
  • emulation - Looking for a Z80 simulator emulator for Linux . . .
    Ok, it appears that you are looking for a software emulation of a generic turnkey Z80 based system (i e , with some basic I O, ROM routines, and RAM) with a simulated classic editor assembler debugger interface You may want to check the MAME MESS project to see if someone has ported a specific single-board Z80 board to MAME –
  • z80 - Decoding Logic and Memory Systems for 8-bit computer - 64K . . .
    In Z80 designs, the ROM PROM EPROM EEPROM is usually placed starting at 0x0000 since when you do a RESET, the Z80 starts executing at 0x0000 and you usually want to have your program start there Of course there are many variations on this depending on your application but this is probably a good place to start
  • Why did TI-8x calculator series use the Z80 processor?
    The Z80 is a wide available CPU with many variations, has great tool collection, and most importantly is available for ASIC integration Which is an incredible argument for system builders (like TI) Integration is the main source of cost savings
  • history - In the original Z80 layout, where are the traps located . . .
    According to Zilog Oral History, Zilog only had a tight schedule to design the Z80 Facing the potential competition, Federico Faggin and Masatoshi Shima were worrying about Japanese semiconductor corporations copying their design: if they managed to clone the Z80 quickly, it would hurt Zilog's sales significantly





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