Can you run a C64 emulation with 40×25 text composite video on a Wemos D1 Mini without additional components?
The video is output using DMA i2s and uses only about 10% of the CPU.The components makes a lowpass filter at 7MHz and a correct NTSC CVBS signal.
The video has a resolution of 320×200 and is a subset of the upcoming ESP8266 TVout library.
Here is the source code for the C64 emulator.
These files are required for compiling it on the Arduino-IDE:
(A ZIP-file with the source code is attached for download)
The emulation has 16K free RAM for basic and only support for the 40x25 text mode.
Keyboard code needs to be added and keys typed poked into the keyboard buffer.
Otherwise it is fully functional.
I'm in the process of porting my emulators to the ESP32.
It has better native support for memory and video.