This is about the previous message i have recently posted.

If the size of 6K sounds too large and it's necessary to know what i'm doing, then it's a calculator with extra functions. But that's not important anyway.

I have checked stack overflow, and it's okay. I only use one entry in the stack (one push & one pop). And the simulator turned out to be okay (it's 8052, i was mistaken). About the hardware, i use simple chips: a latch, a NAND gate, the HD470 LCD... but believe me, the circuit works with all the projects i have done, except with this one... so im sure it's not the hardware (+ i used other people's SAME hardware). About the chip, it could be faulty, but i tried other people's microcontroller, and it still doesnt work.

The thing on my mind now is that it's from the manufacturer of the chip, so i just got a new chip from a new manufacturer, and i will try it today.

I have only 2 interrupt routines, one for the timer and one for the keypad. Some buttons work normally for the keypad. But some require the calling of a function named Analyze. Now whenever those buttons are pressed and the program enters Analyze, it crashes inside Analyze without exiting, and i tried it for all cases on the simulator ofcourse (ive been working on the simulator for a month).

Another possibilty my professor told me, is the length of characters i used for call labels. How many characters are allowed max?


What could the problem be?

Thank you! Please help me!!
Thanks