[syslinux] Cannot execute memdisk

[Miller, Shao]

Good day again, Sinan.

That's great that you are now able to PXE-boot your .ISO.  Hopefully,
the .ISO has DOS or some other INT 0x13-using operating system on it, or
hopefully it simply loads an OS into RAM and doesn't need to access the
MEMDISK virtual optical disc drive ever after that.

A really cheap outline of a typical x86 PC boot process is here:

  http://reboot.pro/13676/page__view__findpost__p__120090

Perhaps its mediocre detail could help you out.

- Shao Miller