DSP Programming on Atari Falcon

     In these pages I will try to teach how to use the DSP in Atari
     Falcon. It consists of a number of pages, some not yet written, which
     will explain step by step now the DSP works and how to use it the
     best way, or at least the best way I know of.

     I will mainly keep to programming at the Falcon and whenever I use
     the word DSP I mean DSP56001 made by Motorola, even though there are
     a lot of other kinds made by other companies.

     First of all I would like to point out that I am not at all an expert
     on this subject, but simply a happy hacker who wants to share some of
     his knowledge. I might also just as well tell you now that it is very
     helpful if you have programmed before, preferrably in 68K assembly or
     possibly in C. Assembly because the DSP assembly language is quite
     like the 68K assembly, and C is a common and easy language to use for
     controlling the DSP, if you don't count demo programming. I will
     often compare the two assembly languages and point out main
     differences.

     Another thing that has helped me a lot for my DSP programming is
     "DSP56000/DSP56001 Digital Signal Processor User's Manual", a book
     written by Motorola. The User's Manual is also available as PDF
     documents from Motorola's DSP homepage. The manual has no Atari
     specific things, but contains all instructions and desciptions of all
     registers in the DSP. The Atari specific parts is documented, among
     other places, in "Atari Developers Manual" and in "The Atari
     Compendium".

     There are some public assemblers for the Falcon and Hisoft has also
     made a Devpac DSP. But the one I use is a public one made by Motorola
     and is called ASM56000.TTP. Together with some other programs it's
     quite simple to use.

     These page contains these parts, so far:
      1. The basic structure of DSP56001
      2. Fixpoint numbers and ALU registers
      3. Addressing modes
      4. Short descriptions of instructions (not yet finished)
      5. Host communication (not yet written)

     More will come soon. I will make those pages more html:ish to, with
     links between, and within the parts.

     Current project using the DSP is a Dolby Surround encoder, which
     directs the input sound and outputs the encoded signal to the
     amplifier in real time. The use of this in demos and games will make
     the feeling, and reality much greater.

     Also take a look at Fredrik Noring's DSP page