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  • The start of x86: Intel 8080 vs Intel 8086?
    Fortunately, the 8086 registers are effectively a superset of the 8080 registers, so we can map A to AL, BC to CX, DE to DX and HL to BX (this ends up with the registers in a non-intuitive order, as HL can be used for indirect memory addressing, which is better supported using BX than the other general purpose registers on the 8086 -- but note
  • Why is the Intel 8086 CPU called a 16-bit CPU?
    The 8086 Family User’s Manual isn’t quite so categorical, but it does describe the 8086 as an “8 16 bit general-purpose micro-processor” with a “16-bit external data path”; and it specifies that all CPUs in the 8086 family “operate on both 8-and 16-bit data types” with “internal data paths are at least 16 bits wide
  • history - Could the Intel 8086 CPU have many segments in memory of the . . .
    The Intel 8086 CPU could address up to 1 MB of memory using segmentation, and this CPU have 4 segment registers, which are CS and SS and DS and ES Each segment in memory can have a maximum size of 64 KB, which means that if all 4 segment registers are used, then 256 KB of memory would be used, which leaves 768 KB of memory unused
  • 8086 - x86 memory alignment - Retrocomputing Stack Exchange
    For the 8086, unaligned word loads (first byte at an odd address) require two memory accesses, but an aligned word (first byte at an even address) can be loaded in one This is excellently explained by answers over at Electronics Stack Exchange: ‘Accessing odd address memory locations in 8086’
  • How does single-stepping on the 8086 interact with internal and . . .
    The 1979 version of the 8086 family user's manual is available at different places in the internet, see 1,2,3 It seems there is no newer version available This manual documents the single-stepping feature in figure 2-29 on page 2-23 and figure 2-31 on page 2-27 Are these diagrams accurate?
  • assembly - Creating 8086 binary larger than 64 KiB using NASM or any . . .
    The important point is that in such an environment no segment operations are needed, because the 8086 operates much like a classic 8- or 16-bit CPU with a flat 16-bit address space (*1) All references within such single segment code are absolute 16-bit constants based with no relation to the 20-bit address space
  • motorola 68000 - What limited the use of the Z8000 (vs. 68K and 8086 . . .
    @MichaelShopsin: The 8086 has the nicest design I've seen for a 16-bit CPU that needs to access more than 64KB of address space It's best viewed as being a contiguous linear sequence of 65536 sixteen-byte chunks, which can be effortlessly grouped into objects of up to 4095 consecutive blocks, that may then be accessed as linear sequences of up
  • 8086 - Difference between the 8255 and 8042 PPIs - Retrocomputing Stack . . .
    A special feature of the 8042 is a built-in bus interface to allow it to easily integrate with Intel master CPUs like the 8086 - but it doesn't necessarily nead to run along one of them The 8255 however, is a completely different thing - It's a peripheral chip to the 80xx line of CPUs that provides 3 byte-wide digital I O ports
  • When specifying Intel 80x86 instruction execution time, what is . . .
    A far direct call takes 36 cycles on the 8088 v 28 cycles on the 8086, i e the difference in time taken to push two words to the stack The ultimate reference for all this, up to the 486 era, is Michael Abrash’s In the Lair of the Cycle-Eaters chapter in the Graphics Programming Black Book (which is adapted from Zen of Assembly Language )
  • How to use BASIC-86 from Microsoft with SCP 8086 simulator
    After the exciting news that a very early version of 86-DOS (0 11) from Seattle Computer Products was found I played a bit with the simh Altair Z80 simulator to run the 86-DOS image and was succe





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