Getting into Virtual Console Development

If you're looking for a virtual console development environment, here are the ones I know about. Use the Pico-8 for easy mode, go for the 6502 Atari assembler if you want to torture yourself. Your mileage may vary.

Atari 2600 Assembly Language Emulator
https://8bitworkshop.com/v3.6.0/?platform=vcs&file=examples%2Fhello.a

Liko-12
https://liko-12.github.io/#/
https://ramilego4game.itch.io/liko12

Nano
https://morgan3d.github.io/nano/

Pico-8
https://www.lexaloffle.com/pico-8.php

Pixel Vision 8
https://pixelvision8.github.io/PixelVision8Website/

Quadplay
https://github.com/morgan3d/quadplay

Tic-80 Tiny Computer
https://tic80.com

Voxatron Voxel Based Console
https://www.lexaloffle.com/voxatron.php