Since nobody seems keen on sharing info… I measured 3.3V between VSS and VDD.
CS1 also measured 3.3V while CS2 seemed to be floating. Not sure why nobody is willing to share what they’ve found.
While I haven’t removed the display yet to check the exact version it seems like the current LCD in the Octatrack MKI is a winstar WG12864A or WG12864AB(3.3V option).
Not much available in OLED’s with the exact pin layout or mounting size. The closest I could find doesn’t match the pin layout or mounting holes. CS1 and reset would need to be swapped but it’s still the same 8bit parallel interface as well as voltage so it would work with some custom mounting and cables (instead of soldering directly to the pin header). It’s just swapping 2 pins and making a mount for it.
Here’s the closest active OLED I could find:
https://www.digikey.com/product-detail/en/NHD-2.7-12864WDW3/NHD-2.7-12864WDW3-ND
Slightly smaller but should fill the opening for the LCD. I’ll probably try it and make a new thread.