英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字，中文词皆可：

安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • 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
  • Comparing raw performance of the Z80 and the 6502
    The Z80's fastest memory fetch — the first half of an operation fetch — takes two cycles That's always paired with another two cycles for refresh though, so the shortest instructions are four cycles long Reads and writes that occur because the opcode tells them to generally take three cycles, though they're not always issued instantaneously
  • What was the last commercial Z80-based computer sold?
    AFAICT, the last Z80 desktop computer sold was the TRS-80 Model 4, in production until late 1991 If you include notebook computers, the Amstrad NC200 was released in 1993
  • Did any computers use the Z80B? - Retrocomputing Stack Exchange
    The Z80 was one of the most popular CPUs of the seventies and eighties In almost all cases that I know of, the version used was the Z80A, rated for 4 MHz, sometimes clocked a little slower in orde
  • 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
  • Z80 Memory Bank Switching - Retrocomputing Stack Exchange
    WAITDRV_ – Drives Z80 WAIT during sound-memory transactions or when the row-write path is active, to meet timing So IC69 ensures nSMOE, nSWEL, nSWEH only assert on the right micro-cycle phases (UCNT state) and only when the firmware has actually targeted the sound path (nCSSM low)
  • Managing registers memory effectively on the Z80
    The Z80 assembler unified the mnemonics to a great extent Its rather abstract angle simplifies first steps In contrast 8080 mnemonics are more diverse, if not chatty, presenting more of the idea behind certain instructions A good example is the already mentioned integrated use of the memory pointer Where Zilog requires an abstract LD B,(HL)
  • Long Term Prevalence of 8080 Code Over Z80 Code in Software Packages
    TL;DR: The Z80 was introduced not long after the 8080 and replaced it quickly and almost entirely for personal computing Still, a large chunk of new software written stayed with 8080 code, making
  • Uses for the halt instruction? - Retrocomputing Stack Exchange
    Unlike 8080 and Z80 the 8085 also tristates all data, address and bus control signals *3 - While the 6502 did not feature a halt instruction (not until the 65C02), Atari's TIA for the VCS did implement hardware to make the CPU go into a forced halt state when accessing certain addresses much like a 'Wait for Line'-Halt instruction
  • Good Z80 disassembler decompiler on modern equipment?
    I have previously played a bit with REZ (the Z80 version of RESOURCE) which was nice but I was wondering if there are better tools now 30 years later running on modern equipment





中文字典-英文字典  2005-2009