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Added "c" in "channel" typo and added a TI-99 bit (#551)

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20Enderdude20 2022-06-22 13:14:23 -07:00 committed by GitHub
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5
papers/doc/7-systems/sms.md
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@ -6,10 +6,13 @@ surely had better graphics than NES, but its sound (fairly weak, 4ch PSG with A-
this console is powered by a derivative of the Texas Instruments SN76489.
the original iteration of the SN76489 used in the TI-99/4A computers was clocked much lower at 447 kHz, being able to play as low as 13.670 Hz (A -1). consequentially, pitch accuracy for higher notes is compromised.
# effects
- `20xy`: set noise mode.
- `x` controls whether to inherit frequency from hannel 3.
- `x` controls whether to inherit frequency from channel 3.
- 0: use one of 3 preset frequencies (C: A-2; C#: A-3; D: A-4).
- 1: use frequency of channel 3.
- `y` controls whether to select noise or thin pulse.