EMU8086 - MICROPROCESSOR EMULATOR is a free emulator for multiple platforms. It provides its user with the ability to emulate old 8086 processors, which were used in Macintosh and Windows computers from the 1980s and early 1990s. It can emulate a large amount of software that was used on these microprocessors, but a savvy user can also program their own assembly code to run on it.
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EMU8086 - MICROPROCESSOR EMULATOR primarily emulates the processor, not the other functions that a microcomputer running a 8086 processor would have. However, it still serves many of the same functions that an emulator for a more specific microcomputer might have, and more besides. For example, both the NEC-P9801 and early IBM-compatible computers used the 8086. Using EMU8086, one might be able to write assembly software that can run on either of those devices. On the flip side, EMU8086 can't access some of the more advanced hardware functionality that you might find in the monitors or other components of those devices.
Bare metal emulators should be downloaded and copied to a microSD card. Specific instructions for each tool can be found in the corresponding download links. Note that in most cases the Raspberry Pi can be simply powered down while using a bare metal emulator. Also, hot swapping USB devices is usually not supported, so connect devices before powering up.
Note that the functions whose names begin with x86Bios more-or-less reproduce the Int10AllocateBuffer, Int10CallBios,Int10FreeBuffer, Int10ReadMemory and Int10WriteMemory members of aVIDEO_PORT_INT10_INTERFACE structure such as filled by the VideoPortQueryServices function. It seems a reasonable hypothesis that the x86 BIOS emulator was developed (primarily, if not solely) so that int 10h functionality for video drivers can be maintained on 64-bit Windows without the need to have these systems support virtual-8086 execution.
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