Use a straightforward BIOS POST jumped to from 0xffff:0x0000 as in real
BIOSes instead of the return call stack to get to 0000:7c00.


git-svn-id: https://dosemu.svn.sourceforge.net/svnroot/dosemu/trunk@1332 7758b857-130e-0410-ab9c-d8735a528d18