CacheVox - The code for import and subsequent playback of digital music from floppy disks.

<b>CacheVox</b> - The code for import and subsequent playback of digital music from floppy disks.

              CacheVox v1.0

                  Memory

         Real Audio Player for GS

               Dedicated ...


   This package of programs you do not need if:
- You do not have the Pentagon 128 and above;
- This Pentagon does not contain a cache (option:
 megabytes);
- This is not implemented Pentagon'e Covox;
- Your friends do not let you ptsshniki Yit mother on 
pisyukovskie button. 


   CacheVox not run under emulation.


   The package is designed to import and then playing with the 
floppy (double density) of digital music medium and high 
quality (mono). Music of different formats (MP3 is not 
recommended) before conversion to the format of the program 
must pass conversion to WAV potok.Format program includes 
compression factor of 2 (exactly) with minimal losses. The 
concept of compression is to restore from each byte two counts 
based on previous otschet.Tablitsy transformations that can be 
found in the accompanying source code, are based on statistics 
and more adjusted for sluh.Poetomu this compression format is 
fully completed. Possible new compression formats will work 
with more complex arithmetic. 

   As a rule, the optimal volume roughly corresponds to twice 
the volume to normalize the sound - that is, you slips my 
converter to normalize the sound, and the converter to double 
it. But you choose ... 8-bit sound, with appropriate conversion 
is much cleaner than that to which you psychologically prepared!


   Bitrate supported by only one: 22kHz. In
the least demanding cycles 22kHz interpolated to 44kHz. Base 
rate not 11 kHz, because I do not like dirty Invader

sound:) In earlier versions, it was used, so it can be returned 
along with the standard, of course, by popular demand:)



   Music is stored on a disk volume 640k
(Files for TR-DOS disk), 800k (MS-DOS) or
960k (5760x170). 0-I track is not used, it can be written 
player. 800k disk drives should be made only here. Formatting 
and filling 960k disks made with two 640k floppy disk copiers 
in the CacheVox. I suspect that these disks are not very 
popular: ( 

   Formatter and restoreru is required for the 48k; copiers 
2x640k-> 960k requires 128k; player - either 48k + Cache, or 
1024k. 


         - The format allows you to bypass some
        rye scratches, which I now consider
        I say ...

                          one programmer


   It is no secret that more than 5760 bytes per formatted DD 
track disc will not fit, of course, if you do not ukrutite 
engine of your drive up to 280 rpm:) And the fit them there can 
be only one way - 7 sectors, of which 5 to 1k. With the 
controller jokes are not jokes, so all of the control field 
path is minimized to create the index stock that

will allow entry to the last sector without disrupting its 
structure and the damage first. In this drive, spinning at 1% 
faster than the standard will not be able written on the 960k 
disk even zero track. 

   For this and many other reasons, 960k
Disk for ZX can not be created on the PC.

   Creating a 960k disk drives tested at 5.25 and 3.5.

   The program can move the sector
track through 7 unnecessary bytes within multi-sectoral gaps, 4 
bytes in the optional field blank (after the title sector) and 
the sequence location themselves sektorov.Vsya work is done 
automatically, but a successful outcome is not guaranteed: (



   Copying of the files is the size of 255 sectors (smp.s, 
smp.0, smp.1 ...). They can throw on a 640k disk

you like. Naplodit them capable Spectrum
Navigator: for this you need to copy
smp.smp in. scl, then this. scl make two, which are recorded on 
the TR-DOS discs.


   Formatting for reliability is a long delay after 
positioning, recording and double-checked the readability. 
Readability is checked in, close to the fighting - before the 
reading is done repositioning. But, nevertheless, to

one of my floppy disks at a certain track record somewhere in 
the middle of the media time to evaporate between formatting

and reading.

   Of course, you have to copiers
podidzheystvovat. But fewer than during recording video 
"Locomotion":) I have the whole process took 11 minutes 45 
sekund.Byla idea generate 960k disk from MS-DOS'nogo with the 
file Rar'e. 

   Provides for restoration of run down
record on 800k and 960k disks. For the 960k is
especially a long process, because it works
similar formatting - more than 7 minutes.


             Package includes:


  1. CacheVox.B - player in the shell, it
same restorery drive 800k and 960k, as well as
option to create a disk from dlinnogodlinnogo 960k file on two 
drives 640k. 

  2. wavpk2pi.pas - converter from WAV (for
default 44 kHz stereo, can comment on other options) in my 
format.Nuzhno compile this program in Turbo Pascal, found in 
the current directory is long enough and WAV to poke nego.V 
result smp.smp 4096 * 255 (can fix this number, for example, 
4096 * 159 or 5120 * 159). Now the program Spectrum Navigator 
or other programs This smp.smp be copied to a clean

floppy disk / diskette, depending what kind of vehicle you 
progotovili for the composition. 

  3. CVoxPlay.H - player in the sources. Needed if the player 
in a shell on your computer does not work, and you know that 
your computer can play music from CDs. (Please send corrections 
at their computers.) He also needed to generate from your

(! Example, setting up 11 kHz or with an unusual number of 
tracks!) Version of BASIC player player to be placed on 0-x 
track any CacheVox-floppies. Old 0 track at the same time is 
formatted to death. Even if the drive was MS-DOS'ny, he turns 
into a TR-DOS'ny. 


             Sad thoughts.


   To write this miracle, like, small in size, it took 10 months
and 3 different computers. Or 4 if you count
separate the old configuration of my PCs and
new, no HDD. Still had to test for
druh other people's machines and use for the conversion of PC 
at work. As if everyone in Program pravilno.No I do not believe

that all the other drives will be just
as I have ...

   Formatting and restore a disk
640k I did not realize, because I do not claim the laurels of 
the creators of FUT (more precisely, FUCK Utility, which shall 
FUT 90% of the code) and especially AIDS. Because I know that 
it is worth to make such a restorer - and some wise guy 
Restaurant start on it the only (of course) a copy of your 
working drive. AND zaporet because "algorithms (p) I" still

smarter than this poor ...

   For other purposes makes sense to use only the formatter to 
800k. Because I decent formatter of the case at all in nature 
is not seen ... First I would like done at the MS-DOS disk 166 
tracks, but it turned out that my PCs when writing to the last 
track of their physical poret.Nu hell with them, I thought. On 
the drive 960k last paths can also prokisnut, but it is almost

no matter t.k.chtenie can always interrupt
Break'om. A play will be just enough
how to read. In any case in
Read all modes (except keshevogo) is
Button Caps - repositioning. More
button in the player: F - promotka forward (in the case of 
reading in real time almost does not help), Enter - change drive

Break - out.


   As I understand it, the development of this project smells 
representable time-consuming ... It is very necessary (as ever) 
a person who would assume the program. I can only

pop-source engines, to more
I have not had enough!


                           A. Coder, author