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Atari ST Interfaces / Connectors / Cables Information
https://info-coach.fr/atari/hardware/interfaces.php
Audio out (ST/STE): This pin is connected to the Atari output amplifier. It normally goes to the Atari monitor sound system; it is possible to connect a 600 Ohms headphone on this output. 2. Composite Sync / Video (STE only): Not present on early ST.
Atari ST Hardware Mod for Audio Ouput (Page 1) - Atari ...
https://chipmusic.org/forums/topic/8942/atari-st-hardware-mod-for-audio-ouput/
Atari ST Hardware Mod for Audio Ouput (Page 1) - Atari - Forums - ChipMusic.org - chipmusic.org is an online community in respect and relation to chip music, art and its parallels.
Atari ST with no sound output (Page 1) - Atari - Forums ...
https://chipmusic.org/forums/topic/2139/atari-st-with-no-sound-output/
If You mean the Atari STfm, then it has audio-output a little bit hidden (however very good because almost without distortions, in oposite to STe models). You have to make a cable for RGB monitor. Separate for vision, separate for audio. Because STfm's sound comes exactly from monitor output.
Atari ST Video Information By DrCoolZic
https://info-coach.fr/atari/hardware/video.php
Audio out and in are coming from the Yamaha YM-2149 sound circuit, and the synchronization signals are coming from the Atari Glue chip. The color outputs on pin 6 (Green), 7 (Red), and 10 (Blue) pass through an amplifier followed by a dump resistor of 27 Ohm resistors on the STF and 75 Ohms resistors on the STE.
BASIC Sound on the Atari ST
https://www.atarimagazines.com/compute/issue70/111_1_BASIC_Sound_On_The_Atari_ST.php
The article is an excerpt from the newly released COMPUTEI's ST Programmers Guide (by the editors of COMPUTE!, $16.95). The Atari 520ST contains a General Instruments sound chip that has three voices (sound channels) and a range of eight octaves. In fact, it's the same sound chip found in the MSX-standard computers sold in Japan and Europe.
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