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fix tandy sound zero writes (NewRisingSun)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2905
This commit is contained in:
Sebastian Strohhäcker 2007-06-29 17:56:07 +00:00
parent cb1db6bf69
commit fd879f6ccc
1 changed files with 4 additions and 4 deletions
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8
src/hardware/tandy_sound.cpp
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@ -106,7 +106,7 @@ static void SN76496Write(Bitu port,Bitu data,Bitu iolen) {
case 2: /* tone 1 : frequency */
case 4: /* tone 2 : frequency */
R->Period[c] = R->UpdateStep * R->Register[r];
if (R->Period[c] == 0) R->Period[c] = R->UpdateStep;
if (R->Period[c] == 0) R->Period[c] = 0x3fe;
if (r == 4)
{
/* update noise shift frequency */
@ -129,8 +129,8 @@ static void SN76496Write(Bitu port,Bitu data,Bitu iolen) {
R->Period[3] = (n == 3) ? 2 * R->Period[2] : (R->UpdateStep << (5+n));
/* reset noise shifter */
R->RNG = NG_PRESET;
R->Output[3] = R->RNG & 1;
// R->RNG = NG_PRESET;
// R->Output[3] = R->RNG & 1;
}
break;
}
@ -147,7 +147,7 @@ static void SN76496Write(Bitu port,Bitu data,Bitu iolen) {
case 4: /* tone 2 : frequency */
R->Register[r] = (R->Register[r] & 0x0f) | ((data & 0x3f) << 4);
R->Period[c] = R->UpdateStep * R->Register[r];
if (R->Period[c] == 0) R->Period[c] = R->UpdateStep;
if (R->Period[c] == 0) R->Period[c] = 0x3fe;
if (r == 4)
{
/* update noise shift frequency */