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  • What was the IBM PC cost saving for using the 8088 vs 8086?
    So an 8-bit machine needed eight of them to populate a memory region A 16-bit machine needed sixteen The 8088 has an 8-bit data bus whereas the 8086 has a 16-bit data bus, so the 8088 is a 16-bit chip for these purposes The IBM 5150 uses 64kx1 DRAM chips per its technical reference manual section 1-13 So when accessing anything in its 64kb
  • 8 bit microcomputers - Do I have to use an 8284 chip with the 8088 . . .
    The 8088 (and the modern replacement 80C88) is available in two speed grades: 80[C]88 (max clock speed 5MHz) and 80[C]88-2 (max clock speed 8MHz) For the 5MHz variant, the requirements for the CLK pin timings are specified as:
  • How much did IBM save by limiting the PC to 4. 77 MHz?
    The 8088 master clock operates at 4x RAM cycle speed Mind you, all these systems above have one system clock per memory cycle The Intel philosophy was quite different, with a fast master clock, but memory fetches only occurring at 1 4 of this speed So the IBM PC clock was chosen, still worshipping the color clock, at 4 77 MHz -- crystal 3
  • 8088 - How to keep the instruction prefetcher filled up . . .
    The 8088 and 8086 are microcoded CPUs, and need multiple cycles to execute each instruction The fastest instructions take at least 2 cycles to execute, and most take much longer Any instruction that accesses memory takes at least 8 cycles, and often more like 15-20
  • Did any 8-bit CPUs use dynamic memory for registers?
    The 8088 was transitional to the 16-bit era Presumably the earlier, 8-bit CPUs would have had even more need to conserve chip area Did any of the 8-bit CPUs use dynamic memory cells for registers? If not, why not? Do static cells run faster, did designers expect people to want to be able to freeze the CPU, or is there some other disadvantage?
  • What is the fastest 8088-compatible machine? [closed]
    What is the fastest 8088-compatible machine? If it's right that Juko XT is the fastest 8088-compatible machine, please also explain why NEC V20 was used to operate only up to 12 MHz on IBM PC-compatible computers
  • The start of x86: Intel 8080 vs Intel 8086?
    @PeterCordes: I've done by share of griping about the 8088 back in the day, but I now recognize that the fundamental design was a work of genius The thing I'd be most curious about is what Stephen Morse thinks of his segmentation design
  • When specifying Intel 80x86 instruction execution time, what is . . .
    It explains the CALL timings too: 23 cycles is for a near direct call on the 8088, where the relative displacement is in the prefetch buffer and doesn’t need to be retrieved; the time taken here is the push required for the 16-bit near return address, which explains the four-cycle difference compared to the 8086
  • 8086 - Are there multiple models of the Intel 8089 IOP . . .
    While the 8086,8088 and 8087 use the scheme of the last number (-3 in this case) being -2 on 8MHz versions and (seemingly very rare) -1 for 10MHz versions, the -3 for me seems out of place Also what clock is it using? I found info about it being 5MHz or 6MHz But didn't find any 8088 CPU (for example) that used 6MHz
  • history - IBM PC memory map - Retrocomputing Stack Exchange
    The 8088 provided an address space of one megabyte The IBM PC allocated that address space as 640K RAM (not that the 5150 could physically take that much, but the address space was allocated) followed by 384K everything else (BIOS ROM, video memory, other memory mapped expansion cards etc )





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