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 Post subject: USB PC2SIO tape functionality
PostPosted: Mon Jul 16, 2007 6:49 am 
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Joined: Sun Aug 10, 2003 11:51 am
Posts: 68
Location: The Netherlands
classics wrote:
:arrow: Cassette motor control support.
:arrow: Direct state/FSK capture and playback of cassette or other SIO data. (Working but still in beta testing)


Already more known about this?
This would make creating .cas images much easier than first recording a .wav file from my tapes. There is no tape deck near my computer. All space there is occupied by Atari's :wink:


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PostPosted: Tue Jul 17, 2007 12:47 am 
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Joined: Tue Aug 05, 2003 9:55 am
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Location: Cleveland, Ohio
Motor control support is included already, but the FSK state sampling is not done. FSK playback does work fantastic and should be in the next APE release. :)

Steve


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PostPosted: Wed Jul 18, 2007 3:06 am 
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classics wrote:
FSK playback does work fantastic and should be in the next APE release. :)


What is the difference between FSK playback and the regular .cas playback already in APE? I thought tape data was send to the Atari as serial data stream and not as audio. Or does FSK playback mean you send sound data out so you can record a .cas file back to tape using a standard Atari tape drive?


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PostPosted: Wed Jul 18, 2007 3:48 am 
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rdemming wrote:
classics wrote:
FSK playback does work fantastic and should be in the next APE release. :)


What is the difference between FSK playback and the regular .cas playback already in APE? I thought tape data was send to the Atari as serial data stream and not as audio. Or does FSK playback mean you send sound data out so you can record a .cas file back to tape using a standard Atari tape drive?


On a real tape, there is not any real notion of serial data, other than 0 and 1 states, which are FSK encoded. Because the source data was serial, the output is also serial. But some tapes have non-serial data on them, like copy protected tapes, or data at baud rates that you can't just play back with a PC uart.

So playing back via FSK samples is playing back the original 0 and 1 states that were present in the tape recording, without trying to decode them into serial data.

The advantage is that it does not matter what is on the tape, or if it is valid data or not, or what speed it was recorded at, it will be played back exactly as it was stored on the original tape.

The down side is since you are working with raw samples, there is no block level error checking, which is used in creating CAS images to fix bad tapes or poor quality samples.

Steve


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