Most files are in Adobe Acrobat format.
The DSP that does all the decoding work. The C32 is cheaper but has less memory than the C31, so for this prototype the C31 was chosen for simpleness of design. A has a serial input port that accepts samples from the DSP's serial port. To make the decoder simple, external RAM is used. The exact part type is a Toshiba or UMC part, but they are compatible with this Motorola part.