Hi all SS Mata Hari owners. I'm currently working on a re-write for Mata Hari, accomplished by plugging in a new processor into the J5 connector on the -17 board. The new board is based on an Arduino Nano and can be built for less than $20. I'm looking for a couple of testers who are willing to build their own card (takes a few hours) and send me videos of their results.

Here are examples of my other re-writes:
https://pinside.com/pinball/forum/topic/stars-2020-new-code-for-stern-stars-1978
https://pinside.com/pinball/forum/topic/black-jack-2020-new-code-for-bally-black-jack-1977

The new code implements roughly the same A/B lane and drop-target awards, but it also implements 5 "modes" for more scoring opportunities. Aside from the card plugged into J5, this re-write uses only original hardware, so it doesn't really modify the underlying machine. The new hardware also supports a switch for "dual-boot" so the old code can be run as well.

Please PM me if you're interested and I can provide more details.
(this is just a hobby of mine--aside from the Nano and a couple of connectors, it's all free. I'm not trying to sell anything)

I'll shoot you a message - thanks!