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simple ym2612 fixes

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This commit is contained in:
notaz 2017-10-07 01:36:22 +03:00
parent 6d28fb5023
commit 151df6adf9
1 changed files with 9 additions and 28 deletions
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37
pico/sound/ym2612.c
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@ -1693,22 +1693,19 @@ int YM2612Write_(unsigned int a, unsigned int v)
v &= 0xff; /* adjust to 8 bit bus */ v &= 0xff; /* adjust to 8 bit bus */
switch( a&3){ switch( a & 3 ){
case 0: /* address port 0 */ case 0: /* address port 0 */
case 2: /* address port 1 */
ym2612.OPN.ST.address = v; ym2612.OPN.ST.address = v;
ym2612.addr_A1 = 0; ym2612.addr_A1 = (a & 2) >> 1;
ret=0; ret = 0;
break; break;
case 1: /* data port 0 */ case 1:
if (ym2612.addr_A1 != 0) { case 3: /* data port */
ret=0; addr = ym2612.OPN.ST.address | ((int)ym2612.addr_A1 << 8);
break; /* verified on real YM2608 */
}
addr = ym2612.OPN.ST.address; switch( addr & 0x1f0 )
switch( addr & 0xf0 )
{ {
case 0x20: /* 0x20-0x2f Mode */ case 0x20: /* 0x20-0x2f Mode */
switch( addr ) switch( addr )
@ -1721,6 +1718,7 @@ int YM2612Write_(unsigned int a, unsigned int v)
else else
{ {
ym2612.OPN.lfo_inc = 0; ym2612.OPN.lfo_inc = 0;
ym2612.OPN.lfo_cnt = 0;
} }
break; break;
#if 0 // handled elsewhere #if 0 // handled elsewhere
@ -1790,23 +1788,6 @@ int YM2612Write_(unsigned int a, unsigned int v)
ret = OPNWriteReg(addr,v); ret = OPNWriteReg(addr,v);
} }
break; break;
case 2: /* address port 1 */
ym2612.OPN.ST.address = v;
ym2612.addr_A1 = 1;
ret=0;
break;
case 3: /* data port 1 */
if (ym2612.addr_A1 != 1) {
ret=0;
break; /* verified on real YM2608 */
}
addr = ym2612.OPN.ST.address | 0x100;
ret = OPNWriteReg(addr, v);
break;
} }
return ret; return ret;