Flashing Floppies

So I installed a Gotek on my Roland S-750. It worked, but it didn't automatically boot the system image when powering on. I had to select the image and then it would boot, which is peculiar.

I spent a lot of time tracking this down. I made extra sure that the flashfloppy config was absolutely correct and pointing to the right image file. I even copied the exact same config from my Roland S-760 that was working correctly and booting automatically. But no dice.

What eventually ended up working was setting pin34 = nchg in the FF.CFG file, though I'm not entirely sure why. In the schematics, it's quite clear that pin34 is active-low, and so "nchg" should be correct.

Or, well, I suppose "D_CANGE" is supposed to be active low. The overbar is clearly visible, at least.

But what gets me is that it's always supposed to be active-low, and I don't really understand why flashfloppy very clearly sets the pin to active high for the IBMPC mode.

This is very peculiar. I'm glad it works, I guess, but it feels unsatisfying that this contradiction doesn't really make sense.