This is actually running the original Dr. Mario ROM using DCPU-16's emulator! Play at https://forkphorus.github.io/#460312186 and change the frame rate to 10 so it can run properly! Running in a different compiler will not work as well! Buttons: Z = (A), X = (B), Space = Start, C = Select, Arrows = Dpad Click "PLAY" to start! Press 1 to change the Zoom. Press 2 to change the frameskip setting (0-slow&smooth, 8-fast&jittery). You won't need to worry about that setting if you changed the frame rate in forkphorus. Press 3 to toggle the border.
Obvious thanks to @DCPU-16.