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Cybernoid

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Posts posted by Cybernoid

  1. Posted

    Next question, how about programming a universal PCM/WAV player ?!? Meaning with input/load routine, a directory option and of course a playback routine (and maybe also a quit to menu / dir. function and a exit to DOS/DUP function)...  That would be very nice. A similar program, called "The sound Utility" by Tom Hunt already exists, but it works only bug-free under sparta or Bewe-DOS (and has many bugs under DOS 2). Last not least it is only 4bit playback...          -Andreas.

    Andreas,

     

    I am working on just such a program. The previous programs were examples to show that it could be done. I have thus so far integrated the extended memory bank and MaxFlash versions into one program.

     

    It has a simple directory listing and file selection utility as well as options to playback files at 4-bit, 5-bit or 6-bit quatizations. I am testing this with DOS 2.0 to be sure that it works on most computers. Also, it automatically finds out how much extended memory is in your machine and uses this memory. It is configurable to load wav files as well as signed/unsigned 16-bit/8-bit stereo/mono PCM data.

     

    It can resample WAV files as well, but the processing time is fairly large.

     

    I have some code working now for the MyIDE version, as well as a program to do RAW DATA writes to the MyIDE disk. (As a side note, I figured out that some IDE drives can be placed into 8-bit data mode, thus allowing us to double our disk space with MyIDE....)

     

    So, the program will automatically detect extended memory banks, 1Mb or 8Mb MaxFlash cart, and internal or external MyIDE interfaces for playback....

     

    -C-

  2. Posted

    Hi all,

     

    I was just curious, but is there anyone out there watching this forum who happens to also work as a video game programmer for a living? (i.e. - you just don't just have video games and Atari as a hobby, but also actually program for today's systems...) :ponder:

     

    Bill Kendrick? Albert?

     

    Cheers,

    Chris/Cybernoid

  3. Posted

    0100100001001111 0100100001001111

     

     

    hehehehehe.

     

    Wouldn't that need to be 

    0100100001001111 0100100001001111 0100100001001111

     

    for Santa-bot? :)

     

    And remember don't get Christmas confused with Halloween:

     

    Oct(31) = Dec(25)

     

    ~C~

  4. Posted

    Hmmm, it looks like Yeahronimo is mostly interested in the MP3 Players (Mpet and Fpet) that Tulip was producing as well as using the Commodore name for trademark infringement lawsuits... Most likely we will not see any other "C64" hardware other than the C64DTV... :(

  5. Posted

    Does the 8-bit use YUV?

    yes' date=' ofcourse.

    [/quote']

     

    Oh, yeah. You are right... If it outputs PAL/NTSC, then it is YUV.

     

    Technically, these would be pal encoder effects. :)

    no, all the filtering and chrominance mixing is done during pal signal decoding.

    Oh yeah, you are right again if you are talking about the PAL decoder in the TV. Sorry, I was thinking about ANTIC/GTIA as a PAL encoder and effects being introduced here... :)

  7. Posted

    not always. the eye works with rgb, but not the brains color perception. luminance is a lot more important than color tone, which again is far more important than saturation. if you spend most bandwidth on luminance, fewer on color tone and the fewest on saturation, you can store much more information in the same amount of bytes.

     

    It can be argued that the eye works in Luminance/Chrominance since there are receptors for brightness only and for color only, but any way you look at it, the eye/brain perceives more changes in Luminance than in Chrominance. So, RGB is optimized for the spectrum, but not optimized for how the eye works. In other words, you can see subtle changes in brightness better than subtle changes in color. So if you build a color space that uses more brightness than color, you can store information changes we can "see" and ignore those we cannot. That is what YUV or YIQ tries to do. I cannot remember, but this color space may take into account the fact that the eye cannot detect blue or red as well as yellow or green...

     

    MPEG uses YUV/YIQ instead of RGB for this reason, it is more efficient according to what we can see, not to what theoretically can be seen.

     

    also, for a system with very few colors (like all 8 bit machines) YUV/YIQ is the #1 choice since it keeps the luminance, but smoothes out chrominance while decoding which in result gives the impression of a "nicer" or "smoother" picture without blurring it.

     

    Does the 8-bit use YUV? Also, in normal Antic modes you can select from 16 colors, but from only 8 brightness levels. You would need more brightness levels for this to be optimized, but technically, 16 and 8 levels can be detected by the eye anyway... However, I do think that this is an optimal way to store the information in the registers: color/brightness. I just wish there were more brightness levels.

     

    that is an emulator screenshot which does not have pal decoder effects.

     

    Technically, these would be pal encoder effects. :) Going from digital data to TV you go through a PAL/NTSC/SECAM encoder, from analog to digital, you go through a decoder...

     

    Anyway, we are way off topic here...

     

    Back to topic...

     

    My mom bought an Atari 400 back in 1979 complete with casette drive! I used this until 1985, when my dad bought me a 130XE upgraded with Omnimon, and the OSB Roms. My parents were divorced, so one weekend I traded my 400 to my dad for the 130XE with 2 1050 drives (one Happy), and a MPP-1000E 300BPS modem. I have used this machine ever since then (except for the 300bps modem). My dad bought me a 520ST in 1987. I used both Atari machines since then for games and BBSing during high school and college. I eventually upgraded the ST to 4Meg in 1997 and put it into an arcade cabinet in 1999...

    Thanks to Atari I am an Electrical Engineer today... but wish I had become a video game programmer... :)

     

     

    Pictures of my stuff:

    post-4398-1104688132_thumb.jpg

    post-4398-1104688133_thumb.jpg

    post-4398-1104688134_thumb.jpg

  10. Posted

     

    Hi!

     

    Very very nice game, really. I like it. But...

    Is there any way how to start new game before all positions are filled up?

    And I think there should be added possibility to delete chars when entering player's name in the option menu.

     

    F.

     

    These are two good features, and easy to implement. I will add the possibility to delete chars in the player's name field and also a way to restart the game in the middle...

     

    Thanks for the input, and if anyone wants to add any other suggestions, let me know...

     

    Thanks,

    =C=

  11. Posted

    I would like to release a version of JellyBeans to everyone, so.... here it is...

     

    I am still updating a few features, but you can play around with it in the meantime. Also, check out Adam's great title screen!!!!

     

    Also, the title screen music, although not fantastic, was written by myself, but in 1987. (Music plays on PAL version only).

     

    In game music can be selected/changed form the options menu. Notice that this disks are full of the RMT music examples, so instead of JellyBeans having its own music, you can create your own to play.

     

    To create music for JellyBeans use RMT, but save the RMT file as a stripped RMT file for address $4000. The maximum size of a music file is 4k, since I have only allowed music form address $4000 to $5000. Save RMT files as *.RMT to the JellyBeans disk!

     

    The terminal needs to be debugged some, but....

     

    So, there you have it... JellyBeans is a Game, a Music Player and a Terminal. Enjoy! 8)

     

    Please checkout the website, too:

     

    http://geocities.com/vlastaar/jellybeans/

     

     

    Cheers and Merry XMAS,

    Chris/Cybernoid[/url]

    jellybeans_1_0_1.zip

  12. Posted

    I am trying to support 1088 memory as well as 256 memory for the XE. Do many people have the 1088 upgrade?

     

    I have written some code into the player to support 1088, but it currently crashes, so I have some questions on how to get this to work.

     

    How do we use the basic and selftest bits in this mode? My program crashes when I set these for some reason...

     

     

    I thought about supporting wav files and their 44byte header, but most wave files will need to be converted anyway...

     

    Also, I use goldwave to translate wav, mp3s, etc into 8bit mono at 13kHz with light hiss removal.

     

    Goldwave:

    http://www.goldwave.com/release.php

     

    _-~C~-_

  13. Posted

    Below are the files for the 6bit PCM player, both for the standard XE and the MaxFlash Cart.

     

    pcmplayer.gif

     

    The player shows the audio waveform (red) and the file progress (blue) on screen.

     

    I will have a better write-up later, but the XE version is autoloading. The MaxFlash version uses the Flip.atr to program the Flash and the pcmplayer.atr to boot and play the data. The Flip.bin file can be used in the emulator modified by Steve. More information on using the emulator here:

     

    http://atarimax.com/flashcart/documentatio...7.html#download

     

    Cheers,

    _C_

    pcmplay_xe.zip

    maxflash_pcmplayer2.zip

    flip_atr.zip

    flip_binb.zip

  14. Posted

    It doesn't matter which version of APE is used as long as it supports R: emulation. I have tested it with APE 98 and on XP. I have even used the emulator to connect to APE. It should be possible to play via an 850 as well.

     

    The only problem I am having now is that there is not enough time for RMT music and network play at the same time... :ponder:

  19. Posted

    Nice one Cybernoid - Pretty good sound quality :)  :thumbsup:  

     

    Just curious regarding your first one - 6 Bit, 4Khz.

    (I'm too lazy to dissable your code I guess) If your're not wiggling the volumes faster than the sample rate like the other example, how're you doing it then?

     

    thanks!

     

    Thanks! Yeah, that one was pure 6bit. Here are a few more 6bit 13.3kHz samples, and the source code. These sound great on the real hardware.

    The code uses all 4 pokey voices in volume only mode for an effective 6bit range. There are some more experiments I am working on, so it may still be possible to do better than 6bit.

     

     

    I am ultimately working on a player for the MaxFlash Cart and for MyIDE.

    The Flash Cart code is written, but I still have a few more questions for Steve... I have talked to Mr. Atari as well.

     

    ~C~

    wavplay.zip

  22. Posted

    Here is another experiment with some higher fidelity audio. This time the audio is sampled at 16kHz, but I am doing some tricks to vibrate the speaker faster than the ear can hear it to cause some half volume samples. This creates a pseudo-7bit PCM playback and works great on the emulator.

     

    I need to try this on the real hardware. I would guess that it might cause some frequency aliasing, and you might hear some unwanted high frequencies...

    pcm_test1.zip

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