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Old 25 February 2015, 06:39   #1
ma693541
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MAS MP3 Player.

Can the Individual Computer's MP3@64 Clockport MP3 Player with the MP3At643507D chip be emulated in the future in WinUAE? Maybe a silly question, but there is already software that use it; AMPlifier (www.katodev.de, included with OS3.9) and other software that supports the mpeg device class (Frogger, MPEGMovie, etc.).

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Old 25 February 2015, 10:59   #2
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What would be the reason for emulating it? Surely a wrapper for mpeg.device that uses the underlying PC resources directly would be a much better option, and that will be supported by Amplifier and any other player.

Anyway, WinUAE normally has plenty of horsepower behind it to run the software decoders without breaking a sweat...
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Old 25 February 2015, 14:34   #3
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Why not? We have now got some sort of Toccata Soundcard emulation with the toccata.library.
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Old 25 February 2015, 15:02   #4
Toni Wilen
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Stupid but possible, it depends how chip works. Most important is chip data sheet.
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Old 25 February 2015, 18:53   #5
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OK. Thanks for the answer Toni.
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Old 26 February 2015, 15:07   #6
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Yep, the emulation for the Toccata library is fine, but the equivalent for the MAS player would be an mhi.library or mpeg.device library that passes the decoding onto the x86 host. That's a decent idea, but you don't need to emulate the MAS itself for that. Emulating the MAS seems like a bizarre waste of resources to me, but of course it is possible and the data sheets are available - pretty sure I have a copy at home.

It's a MAS3507D chip with some simple logic to double the clock from one of the parallel port pins, and the serialised data is fed via another parallel port pin. The schematic is readily available at http://www.mas-player.de/
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Old 26 February 2015, 19:29   #7
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I prefer hardware level emulation. Makes it compatible with all (non-AOS ) operating systems.
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Old 26 February 2015, 20:21   #8
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Bizarre idea - DSP wih ROM fixed program... side to this was always curious why MAS is so popular if better STA013 was offered...
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Old 27 February 2015, 10:08   #9
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Quote:
Originally Posted by Toni Wilen View Post
I prefer hardware level emulation. Makes it compatible with all (non-AOS ) operating systems.
That's a good point, though I have my doubts about any other OS using the MAS player. Still, I guess it would be easy enough to collect the serialised data from the parallel port or clock port registers and feed them to a MAS emulation - the information is basically just the MPEG frames sent directly to the chip, nothing fancy other than a couple of I2C initialisation codes which are in the data sheet: http://www.mas-player.de/mp3/download/mas3507d.pdf and the audio comes out the other side like magic
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