FreeDOS installation error fix

Straight vanilla install of FreeDOS on VirtualBox predictably fails right out of the  ... box. 

As soon as it starts it goes into an endless loop:

invalid opcode at 0fae invalid opcode at 0fae invalid opcode at 0fae ... etc

Bizarrely, adding the parameter 'raw' to whatever call is being made to memdisk is at least a fix for what I was using. 

Press when you get to the main screen and then 

Change from this:

[...]/memdisk

To this:
[...]/memdisk raw

I'm not sure what governs the thing that replaces [...] above. It was different on mine than the documentation where I found this suggested as a fix.