Sega's Shinobi Has Been Unofficially Ported To Neo Geo, And You Can Grab It Now
www.timeextension.com
"This port was made by disassembling the arcade back into source code"

Sega’s Shinobi Unofficially Ported to Neo Geo

Shinobi, the classic System 16 arcade title from 1987, has been ported to SNK’s Neo Geo system by developer h0ffman. This port was achieved by disassembling the original arcade game back into source code, ensuring that all gameplay logic is exactly as in the original.

This development makes Shinobi available on a wider range of NeoGeo systems (MVS/AES/CD), and with plans to expand compatibility soon.

See the original article for an itch.io download link.

Are more interested in this or the Genesis/Mega Drive port?