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This is a video and sound generator chip used in the Commander X16, a modern 8-bit computer created by the 8-Bit Guy. It has 16 channels of pulse/triangle/saw/noise and one stereo PCM channel. Currently Furnace does not support the PCM channel’s stereo mode (except for panning). Depending on the computer’s configuration, the VERA may appear alongside one Yamaha OPM or two Yamaha OPL3 chips.

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Effects

  • 20xx: Set waveform
    • 0: Pulse
    • 1: Saw
    • 2: Triangle
    • 3: Noise
  • 22xx: Set duty cycle (range: 0 to 3F)
  • EExx: ZSM synchronization event
    • xx is the event payload
    • This has no effect on how music is played in Furnace
    • The ZSMKit library for Commander X16 interprets these events inside ZSM files and optionally triggers a callback routine
    • Can be used to make game code respond to beats or certain points in the music

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Chip Configuration

Chip revision: Sets which version of the chip’s firmware to use
  • Initial release: All earlier versions
  • V 47.0.2 (9-bit volume): Introduces a slightly different volume table
  • V 48.0.1 (Tri/Saw PW XOR): Adds the ability to XOR triangle or sawtooth waveforms with a pulse wave
  • X16 Emu R49 (Noise freq fix): Fixes an emulation bug that previously doubled the noise frequency (default)

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