[Coco] makewav

[keithclark1966 at gmail.com]

Thanks for the great explanation.  I understand how they all work now.


On Sat, May 3, 2014 at 4:57 AM, Tormod Volden <lists.tormod at gmail.com>wrote:

> On Sat, May 3, 2014 at 1:56 AM, keithclark1966 wrote:
> > I'm using a program called makewav to convert a .cas file to a .wav file.
> >
> > Here is a sample conversion and the output:
> >
> > keithclark at keithclark-eM355:~/CoCo/toolshed-2.1-linux$ ./makewav -r -0
> -v
> > golf.cas
> > makewav - S record to CoCo/MC-10 audio WAV file
> > Copyright (C) 2007 tim lindner
> >
> > Total data length is 6350 bytes
> > Encoded filename: FILE
> > File type: 0x0
> > Data type: 0x0
> > Start address: 0x0000
> > Exec address:  0x0000
> > End address:   0x18ce
> > sample size: 1200 hertz: 10, 2400 hertz: 5
> >
> > Now, the -r switch is supposed to allow for a binary instead of an S
> record
> > input file.  The -0 switch outputs a basic file as opposed to a machine
> > language file, or a basic data file.
>
> Hi Keith,
>
> A binary input file must be a "pure" binary supposed to be loaded byte
> for byte into the CoCo's memory, for instance the output from an
> assembler, or an ascii (-a) or tokenized (-b) BASIC text file.
>
> A .cas file is something different, it is an encoding of the data
> stream going through the cassette cable, including cassette transfer
> headers, checksums and the like.
>
> What you need is a .cas to .wav converter, like for instance Ciaran's
> cas2wav.pl at http://www.6809.org.uk/dragon/
>
> makewav currently doesn't do this conversion. It shouldn't be too
> difficult to add, since it has all the pieces needed (generating a
> waveform from a bit stream) and just need to skip the header
> generation. But on the other hand there are other tools specialized
> for this.
>
> Note that converting a .cas to .wav is not guaranteed to work. A .cas
> file targeted for emulators often omits the long leader bytes
> sequences (the long tone that you can hear on the start of every
> cassette file) and the "silent" bytes between blocks when there is no
> sound and the CoCo is given time to digest the data. Advanced
> converters might try to parse the .cas file in order to insert leader
> and silent bytes.
>
> By the way, the .cas files generated by makewav -k are targeted for
> emulators and minimum size. That is not the best for e.g. archival
> purposes, but if you use makewav you have the original data file
> anyway and can generate a full .wav directly.
>
> Tormod
>
>
> >
> > It works and it will even load into the coco, but when I list the
> program,
> > just garbage appears.  If I try the machine language version, it starts
> > loading and then stalls.
> >
> > Has anyone got this program to work for them?
> >
> > Thanks,
> >
> > Keith
>
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