PCem

IBM PCjr
Demon Attack
Cartridge games on floppy disk.
http://www.brutman.com/forums/viewtopic.php?f=3&t=364
https://www.brutman.com/PCjr/pcjr_cart_dumping.html

My wish is, PCem support the IBM PCjr cartridges.

I requested the same sometime ago, I also advised Sarah to disable the drive B as PCjr doesn't support and additional floppy unit, and causes trouble with DOS if you have it enabled