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

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This reverts commit 2ffec02e26.
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tildearrow 2022-06-22 15:16:19 -05:00
parent 10183cdfd5
commit c7ea30dda1
1 changed files with 4 additions and 1 deletions
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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. 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 # effects
- `20xy`: set noise mode. - `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). - 0: use one of 3 preset frequencies (C: A-2; C#: A-3; D: A-4).
- 1: use frequency of channel 3. - 1: use frequency of channel 3.
- `y` controls whether to select noise or thin pulse. - `y` controls whether to select noise or thin pulse.