C axis parameters for Fagor 8037TS control

I have a Dynamic GT-27 lathe with a Fagor 8037ts control. I'm having trouble programming the c axis in G90. When I program a C axis negative movement the spindle goes all the way around in the positive direction until it reaches the programmed location. For instance an absolute move from C0 to C10 travels +10 degrees but if you then program C9 the spindle travels 359 degrees in the positive direction to reach 9 degrees. I don't have the parameters for the machine. Does anyone know what the parameter is that changes whether it always moves in the positive direction in G90. It must be an option! It moves in both directions fine in G91. I've fiddled with a few of the parameters where the name sounded promising without any success. I set them back to where I found them but I'm getting frustrated.