Unfortunetly only one of the JX games I have (some boring golf game) is DOS formatted, the rest appear to be proprietary. If I boot the JX into DOS, I can't pop Thunder Force in and look at the files. I have to boot off the disk. I've tried using DOS backup software that can capture a PC Jr disk just fine, but it keeps giving me bad sector errors when I try with Thunder Force.
The JX is a really confusing system when it comes to intercompatibility with other PCs. It's not compatible with a regular PC unless you pop in a special compatibility cartridge, but even when you do it won't run most PC Jr software. I did get a PC JR cartridge game, Pitfall II, to somewhat work on the JX, but the screen's inverted (the underground area is at the top of the screen and vice versa).
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