These floppy images are failing because they spin
waiting for a
keypress with irqs disabled, and SeaBIOS doesn't enable irqs in the
handlers being called (same issue seen on "d090723b.zip" image
reported by Roy).
I've put a test image with a workaround for the issue at:
See below for the patch I used - I'm still researching it, but the
image can be used for testing.
I tested only with NeXTStep 3.3 booting from hard disk and it worked.
I'll test the rest today but considering the PS/2 mouse emulation is
not working (there is a bug in it that prevents NeXTStep PS/2 mouse
driver and old X11 PS/2 mouse drivers working).
But for now, it boots up to the GUI flawlessly.