mirror of
https://github.com/tildearrow/furnace.git
synced 2024-12-22 16:30:26 +00:00
20 lines
771 B
Markdown
20 lines
771 B
Markdown
# Sega Master System
|
|
|
|
the predecessor to Genesis.
|
|
|
|
surely had better graphics than NES, but its sound (fairly weak, 4ch PSG with A-3 is a lowest tone) is subject of several jokes.
|
|
|
|
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 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.
|
|
- 0: thin pulse.
|
|
- 1: noise.
|