Nintendo FDS

About

This is a single channel chip used in the Famicom Disk System hardware by Nintendo. It was an external disk drive unit available for Famicom, games was distributed on disks instead of carts.

The channel uses a 64-step customizable waveform and has a simple frequency modulator.

Instruments

Wave editor

The instrument editor contains a wave editor, the wave is 64 steps long and the amplitude is 64 steps.

Usage: Left-click to change each sample, middle-click to draw a line and right-click to switch between line/dot mode. A few presets are also available.

Use copy/paste wave to copy a MML-string of the wave to/from the clipboard.

Modulator editor

The rest of the controls belongs to the frequency modulator: rate (0 - 4095), depth (0 - 63) and delay (0 - 255) after a note is triggered can be set. (This has been copied straight from MCK).

The big box is the modulation table, where each box tells how much to add or subtract from the frequency. Each value is used twice by the modulator unit, and the frequency is automatically reset each time end is reached. Yellow = 0, green above = +1, +2, +4, green below = -1, -2, -4 and blue is reset to initial frequency. Use copy/paste table to copy and MML-string of the table to/from the clipboard.

There is also a tab with envelopes for volume, arpeggio & pitch.

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