it a simplified hardware environment (with a 32x32 GFX, and keyboard input), an offline version of what can be done online with this site or equivalent
6502 online emulator (http://6502.cdot.systems/)
this is the offline version made in freebasic... compiles fine for windows/linux
its much much faster (here is about 100x faster) than the online equivalents
https://github.com/MyTDT-Mysoft/Fantasy6502 (https://github.com/MyTDT-Mysoft/Fantasy6502)
as additional bonus, heres the binary for the Nintendo DS version.
Nintendo DS Binary (https://github.com/MyTDT-Mysoft/Fantasy6502/raw/main/6502.nds)
screenshots:
6502-Debug.png6502-NDS.png