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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 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!