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It was an interesting little adventure. The whole of the operating environment is controlled through a single software interrupt vector, INT 0xEF. Once I got a document explaining what data needed to be present in which registers when firing the interrupt, it was (sorta) smooth sailing.

Code can be found here. It's 16-bit real mode C, so mind your head!

This would not have been possible without the following sources:

https://www.seasip.info/Gem/aes.html

http://www.ctyme.com/intr/rb-8664.htm