I've made a quick hack that should work on a Tandy 1000 and it looks like this: https://www.youtube.com/watch?v=2RdrLXblnlU With CGA graphics it looks like this: https://www.youtube.com/watch?v=FUEcr7XnbuA And in monochrome: https://www.youtube.com/watch?v=5o3rYTZt6BM

Seriously, proper Tandy / CGA / EGA / Monochrome graphics is on the to-do list.