YM2610 ASM defines

ASM defines for the YM2610 registers by Smkdan.

AY_FINEA	EQU 0 AY_COARSEA	EQU 1 AY_FINEB	EQU 2 AY_COARSEB	EQU 3 AY_FINEC	EQU 4 AY_CAORSEC	EQU 5 AY_NOISE	EQU 6 AY_MIXER	EQU 7 AY_VOLA	EQU 8 AY_VOLB	EQU 9 AY_VOLC	EQU 10 AY_ENVFINE	EQU 11 AY_ENVCOARSE	EQU 12 AY_ENVSHAPE	EQU 13
 * AY38910

PA_CTRL	EQU $00 PA_MVOL	EQU $01 PA_CVOL	EQU $08 PA_STARTL	EQU $10 PA_STARTH	EQU $18 PA_ENDL	EQU $20 PA_ENDH	EQU $28
 * ADPCM-A

PB_CTRL	EQU $10 PB_LRSEL	EQU $11 PB_STARTL	EQU $12 PB_STARTH	EQU $13 PB_ENDL	EQU $14 PB_ENDH	EQU $15 PB_FREQL	EQU $19 PB_FREQH	EQU $1A PB_VOL		EQU $1B PB_FLAG	EQU $1C
 * ADPCM-B

FM_LFO		EQU $22 FM_TIMERMODE	EQU $27 FM_KON		EQU $28 FM_DETMUL	EQU $30 FM_TL		EQU $40 FM_KSAR	EQU $50 FM_AMDR	EQU $60 FM_SR		EQU $70 FM_SLRR	EQU $80 FM_SSG		EQU $90 FM_FNUM	EQU $A0 FM_FBALG	EQU $B0 FM_LRLFO	EQU $B4
 * FM