On the notion of "unhackable" I commented here:
https://news.ycombinator.com/item?id=12671744
@JBrooksBSI
[59]Aug 17
Was MS-DOS copied from CP/M?
[60]embedded.com/electronics-bl...
60. https://t.co/mOR5mLBHwC
http://www.embedded.com/electronics-blogs/say-what-/4442498/...