when I use the boot command, along with the CD-ROM ISOs I have, I can't switch them anymore with ctrl-f4 once drive D is accessed for the first time.

justincase wrote: @SA1988 Where in the source code is the issue? it's probably in vid_svga_render.c, but I'm still not sure where it is exactly, I can only suspect that it is there.

this emulator is really great, but it still has issues when displaying the boot screens of Windows 1.x and Windows 2.x in EGA/VGA/SVGA (640x200 16 color mode), whereas MESS hasn't and I think I found out where the issue is in the source code, but I'm not sure.