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furnace/doc/7-systems/watarasv.md
Electric Keet ad38e7cdfe Documentation updates. 
My, an awful lot has changed!
2025-11-19 19:17:11 -05:00

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Watara Supervision

a failed competitor of Game Boy, straight from Taiwan. released in 1992, it had a tilting screen, $50 price tag, very fast 4 MHz 6502-like CPU, framebuffer graphics and sound capabilities similar to Game Boy.

these are 2 pulse wave channels (same as on GB), barely working PCM channel and noise channel, also not unlike Game Boy. no hardware envelopes or zombie mode, though.

effects

  • 12xx: set duty cycle/noise mode.
    • range is 0 to 3 for pulse and 0 to 1 for noise.

info

this chip uses the Watara Supervision and Generic Sample instrument editors.

sample info

the sample channel is a 4-bit DMA channel with 4 playback frequencies (1953.125, 3906.25, 7812.5, and 15625) assigned to the notes C, C#, D, and D# in all octaves.

max sample size is 4 kilobytes (8192 samples), samples are padded to multiples of 32 samples, and loop points are ignored.

chip config

the following options are available in the Chip Manager window:

  • Swap noise duty cycles: enabled by default. when enabled, short noise is on odd-indexed duty cycles, like on Game Boy, rather than even.
  • Stereo pulse waves: disabled by default. when enabled, it forces pulse channel 1 to the right output channel and second pulse to the left output channel.