Question: I am trying to access I/O space in C. I am using the ioport keyword to access a port at address 0x1000 but the compiler keeps giving me an error " unrecognized ioport name port4000 "

Answer: When compiling code, make sure you use the -v50 option. If you don't, by default the compiler will generate code for the C2x which only has a range of 16 IOports.