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  • 80286 pricing and availability - Retrocomputing Stack Exchange
    The 80286 isn't that much harder, and of similar complexity to the 68020 which was a very popular choice for homebrewers I'd pick the 80386 as the last mainstream processor that was accessible to homebrew design, at least at lower speeds (I certainly wouldn't homebrew a system at 40MHz, but iirc there was a 16MHz version which should have been
  • Replacing 80286 with 68000 - Retrocomputing Stack Exchange
    It's not possible to simple tie a 68k bus to an x86 system and expect the same behaviour Where the 68k uses AS, R W and DTACK to signal access, the 286 hardware wants to see the bus status signals S0 S1, COD INTR and M IO (not to mention HOLD and HOLDA and several other) Thats why every 80286 (usually) got a 82288bus controller attached
  • Were Windows 3. x applications dependent upon 80286 instructions?
    While Windows 3 x operating system stuck to the 80286 platform, did applications compiled for Windows 3 x have to use 80286 instructions explicitly or be aware of the 80286 memory layout? Or was it that as long as the source code didn't use 80286-exclusive assembly, applications could be compiled with an 8086 compiler and leave the protected
  • How to switch an 80286 from protected to real mode?
    Intel designed the 80286 to boot in real mode, use the basic hardware to things up, and then go into protected mode AND STAY THERE, NEVER TO COME OUT, unless power was cycled – John R Strohm Commented Aug 12, 2019 at 18:37
  • Is a Heatsink Needed for an Intel 80286? - Retrocomputing Stack Exchange
    The 80286 has a maximum power dissipation of 3 3W and an operating range of up to 70°C Unless you want to operate near that point, no heat sink is needed The ICs surface is alreaady way too large Beyond that it falls into the same class as iluminated cables and coloured ribbons Not needed but doesn't do harm either (if done properly)
  • 80286 - 0F1h opcode-prefix on i80286 - Retrocomputing Stack Exchange
    On Intel iAPX 80286, as I recall from experience, the undocumented – officially unassigned – opcode position 0F1h was actually decoded as an instruction prefix, thus counting for maximum allowed instruction length (ten bytes), but otherwise not modifying the prefixed instruction: a "no operation" prefix of sorts
  • How is FSTSW AX implemented on the 80286 80287?
    NPS1, NPS2 - Numeric Processor Select - essentially the Chip Select signals for the 80286; CMD0, CMD1 - Command 0 1 - essentially Port Register address lines of the FPU; In case of the 80286 communication these are decoded as the word size I O Ports 0F8h, 0FAh, and 0FCh (*3 *4) Note, that these addresses are only fixed within the CPU
  • Instructions added with the Intel 80286 [closed]
    The 80286 processor added these instructions: ARPL, VERR, VERW, LAR, LSL, SMSW, SGDT, SIDT, SLDT, STR, LMSW, LGDT, LIDT, LLDT, LTR, CLTS To help understand how this
  • 80286 - How do you put a 286 in Protected Mode? - Retrocomputing Stack . . .
    The 80286 microprocessor adds one major programmer-visible feature to the 8086 protected mode operation This text will not cover the 80286 protected mode of operation for a variety of reasons First, the protected mode of the 80286 was poorly designed





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