• if physical address of DMA buffer was beyond 16M, its size was reset
  to zero. This is no longer done.
• default linker is now JWlink.
• debug displays added for mode switch calls.
• Jemm will now use info returned by Int 15h, ax=E820h to mark regions
  in the upper memory area as reserved. If the call was successful,
  Jemm won't scan the memory region C000-EFFF for RAM.
• VME (virtual mode extensions) is now off by default; there exist CPUs
  that claim to support VME but actually don't.
• JemmEx's built-in XMS host will now use up to 8 memory blocks listed
  by ACPI (int 0x15, ax=0xe820). Previously it could just use the one
  with base address 0x100000.
• fixed: shrinking an EMB didn't work correctly.