Search found 20 matches

by Paulo P
Thu Apr 26, 2018 9:00 am
Forum: TWEAKS & FIXES
Topic: Hissing and whistling in the STe audio output
Replies: 112
Views: 13826

Re: Hissing and whistling in the STe audio output

On the STE one, I do hear (and you can hear in the audio) when it starts doing memory test, you can hear the "dashes" on the screen as the come up.. I need to find me headphone adapter and try that again... Yes. That's the same as mine STe. I hear doing memory test the same way (my file Color_&_Mon...
by Paulo P
Wed Apr 25, 2018 11:46 am
Forum: TWEAKS & FIXES
Topic: Hissing and whistling in the STe audio output
Replies: 112
Views: 13826

Re: Hissing and whistling in the STe audio output

If it's any help as a reference, the TT's audio output (twin phono) is a great bus monitor. You can hear all the memory accesses as a twerping "hiss" and it's amplified by the internal pre-amp as if you turn the sound volume down in the control panel the "hiss" decreases also. So, the same situatio...
by Paulo P
Wed Apr 25, 2018 11:44 am
Forum: TWEAKS & FIXES
Topic: Hissing and whistling in the STe audio output
Replies: 112
Views: 13826

Re: Hissing and whistling in the STe audio output

exxos wrote:
Tue Apr 24, 2018 9:30 pm
OK finally got it recorded..
This is pure PC noise... after 10 seconds I start graphics tests...
The interesting thing is that you don't have the peaks at 2600Hz and 15000Hz. Your hiss sounds a little different than mine. :)
by Paulo P
Tue Apr 24, 2018 8:27 pm
Forum: TWEAKS & FIXES
Topic: Hissing and whistling in the STe audio output
Replies: 112
Views: 13826

Re: Hissing and whistling in the STe audio output

No, I didn't run memory test software yet... but I have this feeling that the more RAM access, the worse noise is in the audio out. No matter if it is a direct stereo output or monitor audio (pin 1). So, the question is why and if there is a possibility to defuse this noise and interferences. And w...
by Paulo P
Tue Apr 24, 2018 8:04 pm
Forum: TWEAKS & FIXES
Topic: Hissing and whistling in the STe audio output
Replies: 112
Views: 13826

Re: Hissing and whistling in the STe audio output

Have you run memory test software and checked the audio noise ? Can't remember if its been talked about before, though I think some noise is RAM access noise. So more RAM access, the worse the noise should get.. No, I didn't run memory test software yet... but I have this feeling that the more RAM ...
by Paulo P
Tue Apr 24, 2018 7:43 pm
Forum: TWEAKS & FIXES
Topic: Hissing and whistling in the STe audio output
Replies: 112
Views: 13826

Re: Hissing and whistling in the STe audio output

Maybe I figured out an interesting thing. Hiss is not the same when in color or mono mode. In color mode, the peaks are about 2600Hz and 15000Hz, in mono mode 2600Hz and 6700Hz. I recorded the same situation in both cases. The scratches in the beginning are memory test of TOS 2.06 during boot, the s...
by Paulo P
Fri Apr 20, 2018 9:14 am
Forum: STE
Topic: CA4003290 Rev (C300779-001 Rev B 2) 1989 - Atari STe
Replies: 9
Views: 2821

Re: CA4003290 Rev (C300779-001 Rev B 2) 1989 - Atari STe

I've noticed that one chip on the left of the processor is missing on my board compared to other STe mainboards. Does anybody know, what is it good for? Its the blitter... Its integrated in the large SMT chip to the left on later machines. Thanks very much for your answer. I had a little bad feelin...
by Paulo P
Fri Apr 20, 2018 8:58 am
Forum: STE
Topic: CA4003290 Rev (C300779-001 Rev B 2) 1989 - Atari STe
Replies: 9
Views: 2821

Re: CA4003290 Rev (C300779-001 Rev B 2) 1989 - Atari STe

I've noticed that one chip on the left of the processor is missing on my board compared to other STe mainboards. Does anybody know, what is it good for?
by Paulo P
Wed Apr 18, 2018 5:14 pm
Forum: STE
Topic: CA4003290 Rev (C300779-001 Rev B 2) 1989 - Atari STe
Replies: 9
Views: 2821

Re: CA4003290 Rev (C300779-001 Rev B 2) 1989 - Atari STe

And here are the pictures after recap by Centurion technologies (https://www.facebook.com/centuriontech.eu) and some other little improvements (for example, LMC mixer audio fix). More here: - https://www.exxoshost.co.uk/atari/last/STEDACFIX/index.htm ("STE LMC MIXER AUDIO FIX") - http://forum.8bitch...
by Paulo P
Fri Apr 06, 2018 6:54 am
Forum: TWEAKS & FIXES
Topic: Hissing and whistling in the STe audio output
Replies: 112
Views: 13826

Re: Hissing and whistling in the STe audio output

Has anyone tried my DAC-fix kit to see if it helps with this problem or not yet ? (lost track sorry!) No, I don't tried your DAC-fix kit yet. Is it difficult to apply it? Too much soldering? Unfortunately, I don't have an advanced skills with it. By the way... may you take a short recording of audi...