Hello -- I'm running a custom DOS app on dosbox 0.71 on PuppyLinux 4. In the code, I need to both write to and read from some custom boards at port addresses 0x300 through 0x31A. I see some sections for port access for sound blaster cards etc, but I don't see how I can configure for access to generic ports. Dosemu allows this with the $ports setting, but for some reason runs the app extremely slowly. Dosbox runs the app at the expected speed, but can't write to the ports. Aaargh!!!

Thanks in advance for any help.