Randy, I copied the file dsk_app.c to a safe place and added an FIR filter to the program. The interrupts fail to work. I started removing the changes and eventually got back to my program of 28nov. The interrupts are still not working. I REPLACED the dsk_app.c with the old version, the interrupts are STILL NOT WORKING.
I tried cycling the power on the Spectrum Digital baord and recompiled/ reloaded the old program--the interrupts are not working.
Any ideas?
DE