commit 7186240d1c63f2ab950ba74d6b70f2f2191bfd99
parent d7f99b08fad246cea3e4c681cc0f7cc244dcc1dd
Author: Luxferre <lux@ferre>
Date: Thu, 28 Jul 2022 18:30:18 +0300
Sound clarification
Diffstat:
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/README.md b/README.md
@@ -87,7 +87,9 @@ The lower nibble (bits 0 to 3) of the status can be modified from the applicatio
## Sound output
-ESOP supports monophonic sound output with a beeper controllable via `06` port. As long as the port value is non-zero, the beeper must emit a sound wave of the specified frequency. The frequency is specified in semitones relative to A4 (440 Hz), with A4 itself being located at the value `30`. Setting the port value to `00` must halt the sound output.
+ESOP supports monophonic sound output with a beeper controllable via `06` port. As long as the port value is non-zero, the beeper must emit a sound wave of the specified frequency. The frequency is specified in semitones relative to A4 (440 Hz), with A4 itself being located at the value `30`. Setting the port value to `00` must stop the sound.
+
+Note: this specification does not enforce any particular waveform to be used for playing the notes, but in emulated ESOP environments, a square wave is recommended as the closest option for phone beeper emulation.
## System calls
