NES Architecture: More Than a 6502 Machine by Rodrigo Copetti

Author:Rodrigo Copetti [Copetti, Rodrigo]
Language: eng
Format: epub
Tags: Nonfiction, Computers, Advanced Computing, Engineering, Computer Architecture, Application Software, Computer Graphics, Computer Science
ISBN: 9798201659042
Amazon: B0B7KG42QH
Published: 2019-01-03T13:30:00+00:00

Figure 7.5: Oscilloscope view of all audio channels. Interactive viewer available in the website edition.

Figures: Mother (1989).

One of the specialities of the APU, when compared to the competition, is the ability to produce triangle waves. These are often used as a bassline for the melody. Moreover, by modifying its pitch dramatically one can also use it for percussion.

The APU has one channel reserved for this type of wave. Behind the scenes, a dedicated sequencer takes 32 cycles to generate a triangle signal [38], this limitation makes the resulting triangle waveform take the shape of a step ladder.

On the other side, the respective circuitry does not provide volume control. In any case, some games found other ways by fiddling with the mixer’s volume control.

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