The compand program was written to run within the DSKD debugger interface. To change between the receive and transmit modes simply modify the TR_DEFAULT constant within COMPAND.ASM to be either RECEIVE or TRANSMIT. Next assemble COMPAND.ASM using DSKA.EXE (i.e type: DSKA COMPAND.ASM). Now run DSKD.EXE (i.e. type: DSKD -M2 When inside the debugger program type LD and then enter the file name COMPAND.DSK and press enter. Once the file has been loaded into the DSP, simply press F5 to execute it