b5161a8fe6
New page for the effect list, updates to chanOsc, and links to instrument types from every "system" page.
1.2 KiB
Konami VRC6
the most popular expansion chip to the Famicom's sound system.
the chip has 2 pulse wave channels and one sawtooth channel. volume register is 4 bit for pulse wave and 6 bit for sawtooth, but sawtooth output is corrupted when volume register value is too high. because this register is actually an 8 bit accumulator, its output may wrap around.
for that reason, the sawtooth channel has its own instrument type. setting volume macro and/or pattern editor volume setting too high (above 42/2A) may distort the waveform.
pulse wave duty cycle is 8-level. it can be ignored and it has potential for DAC at this case: volume register in this mode is DAC output and it can be PCM playback through this mode. Furnace supports this routine for PCM playback, but it consumes a lot of CPU time in real hardware (even if conjunction with VRC6's integrated IRQ timer).
effects
these effects only are effective in the pulse channels.
12xx: set duty cycle. range is0to7.17xx: toggle PCM mode.
info
- this chip uses the VRC, VRC (saw), and Generic Sample instrument editors.