Fix AY PSG clock divider function when exists, Update emulation core (MAME AY PSG and compatibles - includes noise routine updates)
Fix configuration flag, Add MSX Darky sound expander to preset
Clock divider isn't affected to expanded mode's tone and noise generator?
So that they are consistent with NES expansions.
For X16, the VERA is more integral to the system and has lower I/O address than YM2151
and YM2151 was once an expansion chip during development.
2 Pulse channels:
- 8 level pulse duty cycle, DAC mode(just ignores duty cycle)/pulse wave mode, 4 bit volume.
- Furnace support PCM playback in pulse channels with duty cycle ignore mode.
Sawtooth:
- nothing but 6 bit volume (8 bit accumulator in technically) and 12 bit frequency (periodic).
VRC6 instrument:
- 6 bit Volume macro for finer sawtooth volume handling, also 3 bit Duty cycle macro for pulse channels.
Duty, PCM mode command and Duty macro affects for pulse channel only.
Standalone OPLs
Sound Blaster Pro 1.0
Earliest Sound Blaster Pro has 2 OPL2s, it supports stereo like successor but with hardpanned OPL2: one for Left output and one for Right output.
PC-FXGA
PC-FX, SuperGrafx on steroids, Released at December 1994 in NEC.
PC-FXGA is PC add-on card version of PC-FX for IBM PC and PC-98. It's released at 1995 with 3D acceleration - it lacks at original PC-FX console.
SAAYM
Modern CMS/Game Blaster Compatible PC ISA sound card with YM2151 addon. Commander X16 will be use its configuration but SAA in X16 is finally replaced to VERA.
Seta 1 + FM Addon
X1-010 and YM3438, Both driven by Z80. Ultra Toukon Densetsu used this configuration.
