The limitations of the RFB gui are documented. It doesn't support connections with > 8 bpp color depth, but your VNC viewer requests 24 bpp. Please set up your VNC viewer to use the formats RGB332 or BGR233. If you need support for > 8 bpp, or you'd like to use Bochs in a web browser you should try with the 'vncsrv' gui that requires the libvncserver library. You should visit the Bochs page on GitHub to follow the development.
The limitations of the RFB gui are documented. It doesn't support connections wit > 8 bpp color depth, but your VNC viewer requests 24 bpp. Please set up your VNC viewer to use the formats RGB332 or BGR233. If you need support for > 8 bpp, or you'd like to use Bochs in a web browser you should try with the 'vncsrv' gui that requires the libvncserver library. You should visit the Bochs page on GitHub to follow the development.
failed to build bochs 3.0 on macos
Fixed in Bochs source tree on GitHub.
Bochs 3.0 released
Bochs 3.0 released
Graphical startup logo in BIOS
There are no plans to implement something like that. If you want to have something like that, you could try https://github.com/fysnet/i440fx.