I have a fortran program I would like to run on some kind of portable device. Ideally, it would be an older and cheaper device. Does anyone have any advice? The program takes an input from the user (which is an incorrect luminance value read from a 40 year old light meter) and feeds it through a simple calibration curve and outputs a list of shutter speeds (corresponding to those available on a camera) and calculated f-stops to give proper exposure. I describe the program to make sure that it is known how simple the calculations are and how low-tech the device would need to be. Preferably it would be something that could fit in my pocket. Thanks!