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Hi and thanks!<br />
I've actually managed to get it going, but I had to change the IRQ-mask to enable IRQ10 and IRQ11. This wasn't done by BIOS at start-up as I expected. Also an EOI has to be sent (both to address 0xA0 and 0x20) to the PIC just before leaving the ISR. <br />

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Hi and thanks!
I've actually managed to get it going, but I had to change the IRQ-mask to enable IRQ10 and IRQ11. This wasn't done by BIOS at start-up as I expected. Also an EOI has to be sent (both to address 0xA0 and 0x20) to the PIC just before leaving the ISR.


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I'm having problems getting my interrupt service routines to work properly. I use the good old Borland TC and follow the examples when setting up my ISR and when saving old vectors and plugging new ones. But still, it doesn't matter how I excite the IRQ-channels, I never manage to enter the ISR. I use IRQ11 on an embedded 386-system. Can you give mee a hint about what could be the problem, I've run out of ideas.<br />
<br />
Cheers!<br />
Fredrik Bagenholm
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I'm having problems getting my interrupt service routines to work properly. I use the good old Borland TC and follow the examples when setting up my ISR and when saving old vectors and plugging new ones. But still, it doesn't matter how I excite the IRQ-channels, I never manage to enter the ISR. I use IRQ11 on an embedded 386-system. Can you give mee a hint about what could be the problem, I've run out of ideas.

Cheers!
Fredrik Bagenholm

How to setup an ISR in Turbo C++.

C is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations. By design, C provides constructs that map efficiently to typical machine instructions, so it has found lasting use in applications that had formerly been coded in assembly language, including operating systems as well as various application software for computers ranging from supercomputers to embedded systems. It is distinct from C++ (which has its roots in C) and C#, and many later languages have borrowed directly or indirectly from C.