Nintendo NES square channel

stock · Posted: Tue Feb 01, 2011 10:29 pm Post subject: Nintendo NES square channel

This patch is based on a retro-ingeniering documentation of the 2A03 (NES's integrated CPU) found on the internet. I stick as close as possible to the specification.

The control is made with two 8-bit registers (originaly there are 2 more register, but they control only pitch and note length) mapped on two first OSC parameter pages of the modular.

and here are the controls :

$4000.0 ~ $4000.3 : decay time
$4000.4 : envelope ON/OFF
$4000.5 : envelope loop ON/OFF
$4000.6 ~ $4000.7 : waveform (4 types : thin pulse, pulse, square, reversed pulse)

$4001.0 ~ $4001.2 : sweep amount
$4001.3 : sweep mode (UP/DOWN)
$4001.4 ~ $4001.6 : sweep rate
$4001.7 : sweep ON/OFF

NES SQ1.pch2

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NES SQ1.pch2

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