[Qemu-devel] [Bug 1180923] Re: unused memory filled with 0x00 instead of 0xFF

[Battler]

Also, as for reproduction instruction:
Start MS-DOS and make sure to bypass CONFIG.SYS and AUTOEXEC.BAT.
Then run Microsoft Diagnostics (MSD) and press M for Memory. Look at the Memory 
Map: areas that are available, get marked as either "potentially available" 
(which means EMM386 will treat them with caution and not address them unless 
told to) or "Option RAM", well as anything but "available".
Or just load EMM386.EXE from CONFIG.SYS with a simple DEVICE=EMM386.EXE 
(preceded by DEVICE=HIMEM.SYS obviously) and reboot. You'll get an error 
message telling you that EMM386 was unable to find a page frame for EMS, and 
MEM will report 0 upper memory.

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https://bugs.launchpad.net/bugs/1180923

Title:
  unused memory filled with 0x00 instead of 0xFF

Status in QEMU:
  New

Bug description:
  Qemu, ever since it was made (so, since 2003), has this problem in DOS
  (either PC-DOS or MS-DOS and partly Windows 9x) not recognizing the
  memory available when the memory is filled with 0x00 but when it is
  filled with 0xFF it gets recognized properly, where should I patch
  qemu to solve this memory problem?

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