[Qemu-devel] [Bug 995758] [NEW] Possibly inaccurate statement in PC Platform Docs

[Graham Cottrell]

Public bug reported:

The documentation at:

http://wiki.qemu.org/Documentation/Platforms/PC

Contains the statement that the processor, after reset, executes code
starting from address 0xFFFFF, corresponding to the last byte of the
single megabyte of memory in the old 8086 address range.

>From my recollection of working in the microcomputer industry in the
late 1980's, execution actually starts in real mode at the start of the
last 16 bytes of addressable memory, at 0xFFFF0.  Think about it - if
it's the last byte there's no room for an address operand to accompany a
1-byte opcode.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/995758

Title:
  Possibly inaccurate statement in PC Platform Docs

Status in QEMU:
  New

Bug description:
  The documentation at:

  http://wiki.qemu.org/Documentation/Platforms/PC

  Contains the statement that the processor, after reset, executes code
  starting from address 0xFFFFF, corresponding to the last byte of the
  single megabyte of memory in the old 8086 address range.

  From my recollection of working in the microcomputer industry in the
  late 1980's, execution actually starts in real mode at the start of
  the last 16 bytes of addressable memory, at 0xFFFF0.  Think about it -
  if it's the last byte there's no room for an address operand to
  accompany a 1-byte opcode.

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