We have inherited a legacy application which runs under DOS 6.2 and the Phar-Lap DOS extender (if anyone is old enough to remember that). It also uses up to 6 serial ports (16550) which are expected to exist at fixed port addresses & IRQs. There are still many of these systems in the field but the PCs are starting to fail and finding compatible motherboards is impossible due to the hard-coded IRQs used.
(The software installs interrupt handlers for the COM ports with COM3 to COM6 expected to use port/IRQ combinations of 3E8/10, 280/11, 2A0/12 & 3A8/15. With modern motherboards, this is a problem).
Does anyone know of any virtualization technology which allows you run-up a DOS guest on a host with 6 COM ports whose physical resources are mapped to the guest as above? The display requirement is VGA 640X480 and there is no network requirement.