Handle time of received interrupt in windows

I have an external controller with only one button connected to PC with RS232. Operating in Windows, I want to know the time of hardware interrupt being received. Time of control being received by user application process is incorrect here.

I want to know the way of redefining the primary ISR (like asm "int 14h") in Windows? Or maybe there is also a way how to this already catched time in user application (so no redefinition is 开发者_运维技巧required)?

int 14H is right for actually handling the UART on COM1 or COM2: see here. But setting up an ISR is a different matter and for that I would look around for a BIOS listing. It might be hard to find, but I don't believe there's any way around it. Try googling "pc BIOS listing"; you might get lucky.

There is a way to chain ISRs together so that you don't put too much hurt on the Windows driver.

Oh, here you go. Google "pc interrupt service routine" to find a whole bunch of references.

And, hey! Good luck!