Proceed very carefully as wrong entries in the registry could prevent
Windows NT from starting! Therefore, you should save your registry before.
Hint: ‘PermitShare’ is a variable of Windows NT.
Using shared interrupts for COM ports under
Windows 9x
Under Windows 9x, sharing COM ports does not require special provisions
other than correctly configurating the resources used with the Device
Manager.
However, to avoid port address conflicts, you must ensure that two different
pieces of hardware on the AT bus would not fight for the same interrupts /
resources.
Using COM ports un der Wind ows 3.x
Windows 3.x only allows the use of four COM ports. It does not allow
interrupt sharing!
Using COM ports un der DOS
Interrupt support for COM ports is not provided at all by the operating
system. So, it is the responsibility of the application program provider to
provide interrupt support, as e.g. RDI drivers do.
However, to avoid port address conflicts, you must ensure that two different
pieces of hardware on the AT bus would not fight for the same interrupts/
resources.
13
USING SHARED INTERRUPTS
