I've made some upgrades to the SD Mapper project. I've switched to using a microSD card because apparently, size matters. 
And to take things even further, I've decided to integrate the 8266 directly onto the PCB. So... no need for separate boards from China! Well, the 8266 still comes from there... lol
I've also connected a tiny 128x32 OLED screen to display the IP address of the WiFi interface. That way, I can conveniently connect to the "microSD mapper" using my PC. I'm also using my custom 8266 firmware that writes the IP address to the IP.CFG file on the root of the microSD card every time the MSX computer boots up.
I still have a few jumper wires on the prototype and those will be fixed on the next PCB batch. So far, so good. I'm quite pleased with the results.
Hello everyone! I recently had the opportunity to test the FYSETC SD WIFI PRO with the SD Mappers, and it is another alternative to wireless access the SD card content. This particular SD card comes with an embedded ESP32 PICO V3, making it the best form factor I've come across so far.
The card works well with the SD Mapper V2, although I encountered compatibility issues with the V1 version. While it performs as expected, I found its firmware to be lacking. Unlike the WebDAV solutions available for 8266-based boards, the interface of this card does not allow for file uploads to specific folders; only the root of the card is accessible. It also blocks access from the MSX until you retry from MSX-DOS.
Nonetheless, since it is based on the ESP32, we have access to a broader range of libraries and increased processing power, presenting an opportunity to develop a more robust firmware. I am currently working on porting the firmware I created for the 8266 to this ESP32 PICO, and I hope to complete the process as soon as possible.
I have included a few screenshots showcasing the card, its development board, and the web interface used for file uploads. I also published a video with my initial tests at https://youtu.be/CiZZm-57y-g
