I recently acquired a few additional displays for Tiny C2N Monitor from eBay. As I had commented before, it seems that sellers had started selling version 2.1 of ILI9163-based modules without making buyers aware of the substantial changes between version 1.1 and 2.1.
When I recently saw version 1.1 of a ST7735-based module I thought it to be compatible with the ILI9163-based ones, so I bought a few. Once I received the display modules I noticed these were quite different from the ILI9163-based ones with whom I had worked in the past: neither driver adjustments for version 2.1 nor 1.1 of the ILI9163-based modules are suitable for this new ST7735-based module.
Although I have little motivation at the moment, I will have to adapt my driver code to fully support these display modules: specifically, I have to figure out some of the properties of these displays before I can use the hardware scrolling.