PC Engine TurboGrafx-16 Architecture: A Small but Quick Leap 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: 9798201631406
Amazon: B0B6RMSK3M
Goodreads: 62908912
Published: 2020-12-17T14:30:00+00:00

There are six audio channels in this system [8], each one is set up by writing to a set of registers. The latter stores the attributes of the channels, which include:

Waveform shape: The waveform cycle is generated using thirty-two 5-bit values, each one corresponds to the amplitude of the wave at a particular time. Some games like Fire Pro Wrestling 2 and Bloody Wolf even altered the values during playback to obtain special sounds (at the expense of audible clicks during transfers).

Frequency control: Two 8-bit registers alter the frequency of the channel to produce different musical notes with the same waveform.

Amplitude level: A single 8-bit register stores two 4-bits values that specify how loud the channel will sound. The two values correspond to the ‘Left’ and ‘Right’ panning control, a pioneering feature compared to what the competition offered.

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