Ian Hawdon wrote:

     > Most of the players have an Actions ATJ2085 CPU chip
     > http://www.actions.com.cn/en/product.aspx?id=10 and can indeed
    play OGG
     > files (though their website doesn't say this)

    I'd say that this CPU/microcontroller is the most limiting factor to get
    Rockbox on these players: Rockbox is only built for and running on
    32 bit cpu
    cores, so this Z80 8/16? bit will require some work to get Rockbox
    for. We
    once had it buildable for a 16bit CPU (calmrisc for one of the older
    Archos
    gmini models), but that particular port was abandoned and most of
    the long/int
    cleanups of those days are likely gone by now.

The data sheet says 8bit! There is a DSP that does the MP3 decoding and a DMA controller, so most likely the z80 does little besides reading the FAT filesystem and setting up the DMA to pipe data from Flash to the DSP.







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