Short:    CBM compat. device for MP3@64 MP3 Player
Uploader: hodges@in.tum.de (Chris Hodges)
Author:   hodges@in.tum.de (Chris Hodges)
Type:     mus/play
Version:  V1.0 (17-Jun-06)
Requires: Individual Computer's MP3@64 Clockport MP3 Player

MP3At64MPegDevice V1.0
~~~~~~~~~~~~~~~~~~~~~~
Finally there is a commodore  standard  device  for  Individual  Computer's
MP3@64 Clockport MP3 Player (mpeg layer 2 and 3 hardware decoding using the
MP3At643507D  chip)  which  can  be  used  in  conjunction  with  AMPlifier
(www.katodev.de,  included with OS3.9) and other software that supports the
mpeg device class (Frogger, MPEGMovie, etc.).

The MP3At64mpeg.device is based on the framework of  the  melodympeg.device
by Thorsten Hansen. This software is Freeware. Comments appreciated though.


Requirements
~~~~~~~~~~~~
You will need the MP3@64 Player, connected to a clockport of the following
Zorro cards (or internal clockports of your A1200):

- Highway USB
- Unity Prototype
- X-Surf
- ISDN-Surfer
- VarIO
- Buddha flash
- Kickflash


Installation
~~~~~~~~~~~~
Just copy the mp3at64mpeg.device file into your  DEVS:  drawer.  Give  this
device  name for AMPlifier etc. Multiple units are supported in theory, but
this has not been tested.


Included Extra Stuff
~~~~~~~~~~~~~~~~~~~~
MP3At64Play by Thorsten Hansen:
  Simple CLI tool to play back an MP3 file. Slightly modified for MP3At64.


Tech Bits
~~~~~~~~~
The device does not allocate a CIA timer for its interrupt. It does all its
transfers  during  a  soft interrupt. This means that you should be able to
use your internal  serial  port  in  case  you  connected  the  power  plug
somewhere  else. Moreover, all hardware resources are allocated in a system
friendly way, so there should not be any interferences with  other  conform
software trying to use the parallel port in any other way.


Known Problems
~~~~~~~~~~~~~~
- Sometimes the sound is interrupted for a short period. Seems to be a  bug
  in  the  timer.device  that  sometimes causes interrupts to be delayed. I
  tried very small intervals, but it still remained, so I guess it's either
  a bug in timer, or the system interrupt load causes high latencies.
- Volume control is not possible yet.

History
~~~~~~~
V1.0 (24-Jan-01):
  - Initial public release.


Contact address
~~~~~~~~~~~~~~~
Any mail, comments or donations welcome:

Chris Hodges                    Account: 359 68 63
Motorstr. 34a                   Bank   : Sparkasse FFB (700 530 70)
80809 München                   IBAN   : DE61 7005 3070 0003 5968 63
Germany                         SWIFT  : BYLADEM1FFB
Tel.: +49-89/54843054           WWW: http://www.platon42.de/
Email: chrisly@platon42.de      IRC: platon42 on EfNet/Arcnet