User manual

Using shared interrupts for COM ports under Windows 95
Under Windows 95, sharing COM ports doesn’t require special provisions
other than correctly specifying the resources used in the Device Manager.
However, in addition to avoid port address conflicts, you must ensure that
no two different pieces of hardware on the AT bus are fighting for the
same IRQ!
Using COM ports under Windows 3.x
Windows 3.x does not allow interrupt sharing!
Windows 3.x only allows for using 4 COM ports!
Using COM ports under MS-DOS
Interrupt support for COM ports isn’t provided at all by the operating sy-
stem. So, it is the responsibility of the application program provider to pro-
vide for interrupt support, as e.g. RDI drivers do.
However, in addition to avoid port address conflicts, you must ensure that
no two different pieces of hardware on the AT bus are fighting for the
same IRQ!
COM Board
GB - 17