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nasty niff

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Posts posted by nasty niff

    FujiConvert 0.1

    in Atari 8-Bit Computers

    Posted

    7 minutes ago, CharlieChaplin said:

    1) Stereo A8 with powered desktop speakers alongside the tv:

    (power on/off, volume, loudness)

     

    1.thumb.jpg.c90f820faa05f4fd65160cfc039a3d4d.jpg

     

    2) to the right side is even more power - my Hifi stereo system:

    (often connected with the A8's stereo output)

     

    2.thumb.jpg.783cd4488b3a8cbcb3425938e432fdb2.jpg

     

    top to bottom:

    2x JVC Tapedeck

    lots of Mini-Discs

    1x CD-player

    1x Mini-Disc recorder

    1x CD-recorder

    1x Receiver

    (and 4 large three-way speakers)

     

    Atari XLwith 30 watt powered pc speakers.

    Top  picture,stereo 600w amp, mini disk, tape, cd.

    2 pair of 3 way speakers with ribbon tweeters plus sub

    PXL_20230822_203907813.MP.jpg

    PXL_20230822_203858783.MP.jpg

    • Like 4

    FujiConvert 0.1

    in Atari 8-Bit Computers

    Posted

    6 minutes ago, CharlieChaplin said:

    Hmmm,

     

    is it wishful thinking or could it be true:

     

    - not everyone has Pokey stereo, many Atarians still have mono Pokey (PDM)

    - not everyone has Covox, many Atarians still have only Pokey in mono or stereo (PDM and PDS)

    - but: if someone has Covox, he for sure has stereo available (COS)

     

    Which means COV (Covox mono) does not make much sense for me, except maybe that it is 44khz instead of just 22khz...

     

     

     

    the quality isnt that great @22khz stereo, too much noise

    FujiConvert 0.1

    in Atari 8-Bit Computers

    SAVO, SAVO CLASSIC (rev. 2), SAVO+, SAVO MAX, HAVO, O2/Fixer and other upcoming projects

    in Atari 8-Bit Computers

    Posted

    9 hours ago, Beeblebrox said:

    As ever you do have a point there. :) 

     

    Now I am off to the supermarket to decide on which Pepsi I am gonna buy, (PepsiMax, PepsiZero, PepsiHero, PepsiFatmax double caffeinated, PepsiFlavourfree, Pepsi and Shirely (you have to be a Brit in the UK of a certain age to get that last one). :)

    prefer rola cola to be honest, comes in one flavour

    • Haha 1

    FujiConvert 0.1

    in Atari 8-Bit Computers

    Posted

    20 minutes ago, CharlieChaplin said:

    Audioalter generates a new file, but alas outputs MP3 format only with 128kbps ?!?

    Or does it have a setting somewhere, where I can setup to use MP3 output with 256kbps ?

    (Or at least the same output as input, since I am mostly using MP3 with 224kbps.)

     

    off-topic: My Hifi Mini-Disc recorder by Pioneer does have Digital Noise reduction by Dolby. Just for fun, I name it Dolby Digital Noise Reduction (it reduces the noise of Dolby Digital, hahaha..., especially since Mini-Disc only has stereo hahaha...)

     

    https://online-audio-converter.com/ this version with the audio convertor @320kbps, dont hear much difference between 128 and 320

    The Mamas & The Papas - California Dreamin' (online-audio-converter.com) covox mono 44270Hz ide pal.zip

    FujiConvert 0.1

    in Atari 8-Bit Computers

    Posted

    30 minutes ago, CharlieChaplin said:

     

    Thanks for the info! In the last months I used Beeblebrox's settings (DC Offset -7, Coarse levels 16, Fine levels 2, Bump 0, non-linear 5/7, linear 4/6), but noticed recently that your settings sound better with my equipment. But today I found out that either a) the type of Pokey or b) the type of stereo enhancement makes a big difference regarding playback quality...

     

    Lucky me, I do have two Atari 800XL computers with stereo enhancements and Covox. The Covox is a PIA Covox by Lotharek in both computers, but there are two different stereo enhancements, one computer has a stereo enhancement by Lotharek with two Pokey chips (both by OKI 1979) and produces a lof of white noise, while the other computer has a stereo enhancement by tf_hh with two Pokey chips (one by OKI 1979, the other by AMI without a date/year) that produces much less white noise. Unsure if the more vs. less white noise comes from the Pokeys or from the stereo boards.

     

    Lotarek_stereo_enh.thumb.jpg.4c795503adc4c3247468bca105213d10.jpg

    (above: Lotharek stereo enhancement)

     

    TFHH_stereo_enh.thumb.jpg.3c39e505f655ea741b8602b40e153f9e.jpg

    (above: tf_hh stereo enhancement)

     

    Find attached a short example, a PDM (yes, mono!) file played back on both machines. The two 800XL computers did use the same power supply, the same cables, the same AVG cart and the same PDM file. But the playback quality differs quite a lot - recorded approx. 30 seconds of the output with my Hifi CD-Recorder onto CD-RW and then converted it into MP3 on the PC to save some space.

     

    Here is recording one, made with the 800XL with Lotharek stereo enhancement:

     

     

    and here recording two made with the 800XL with tf_hh stereo enhancement:

     

     

    And here is the (zipped) PDM file I used:

    CD.zip 6.13 MB · 0 downloads

     

    Allthough I am hard-hearing, I can hear quite some difference between the two played back files, on the 800XL with Lotharek the quality is not good and there is a lot of white noise, on the Atari 800XL with tf_hh enhancement the quality is better and there is less white noise. Still have to find out if the Pokey chip is responsible for the quality or the stereo enhancement. And errmmm, I did not use any kind of Dolby (Digital) or other noise reduction.

     

     

    TF_HH sounds far better, i use a pokeymax nowadays, have lotharek pokey in my other xl.

    pokeymax is far better especially with covox enabled.

    FujiConvert 0.1

    in Atari 8-Bit Computers

    Posted

    9 hours ago, CharlieChaplin said:

     

     

     

    Hmmm,  @nasty niff

     

    looks like the settings are in the filename... so are these correct:  ???

     

    DC offset: +7

    Coarse Levels: 16

    Fine levels: 16

    Bump: 0

    Non-linear: 4/6

    Linear: 4/6

     

    I am asking, since my PDM conversions for Pokey do have a lot of (white) noise, while your conversions are almost noise-free.

    Besides, what Gain level did you use (or did you use Auto Gain) ?

     

    I use gain +2 and that's the settings in the file name.the new files I have done use covox and are pretty good....just need Dolby digital for Atari 

    DolbyDigital.jpg

    • Like 1

    Pit-Fall

    in Atari 8-Bit Computers

    Posted · Edited by mistapaul

    6 minutes ago, Beeblebrox said:

    Poss dumb question but running the ATR in Altirra takes you to DOS, where a dir search gives you a pitfall.new file. How do you load it? Loading from DOS gives you a bad file message.

    Run"d:

     

    • Thanks 1

    ICD U.S. Doubler

    in Atari 8-Bit Computers

    Posted

    Tried it on both drives - real hardware, it uses sector skew for us doubler when you create the menu.

    First 3 sectors(I think) have code to enable high speed for doubler or happy.this code was used for the later AURA menus...

    • Thanks 1
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