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SC-01: fix DDRB support for #952

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This commit is contained in:
tomcw 2021-05-16 19:49:34 +01:00
parent 21146cb65e
commit 110a706535
1 changed files with 2 additions and 2 deletions
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4
source/Mockingboard.cpp
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@ -615,10 +615,10 @@ static void SY6522_Write(BYTE nDevice, BYTE nReg, BYTE nValue)
pMB->sy6522.ORB = nValue;
if ((nDevice&1) == 0 && // SC01 only at $Cn00 (not $Cn80)
pMB->sy6522.DDRB == 0xFF && pMB->sy6522.PCR == 0xB0)
pMB->sy6522.PCR == 0xB0)
{
// Votrax speech data
pMB->ssi263.Votrax_Write(nValue);
pMB->ssi263.Votrax_Write((nValue & pMB->sy6522.DDRB) | (pMB->sy6522.DDRB ^ 0xff)); // DDRB's zero bits (inputs) are high impedence, so output as 1 (GH#952)
break;
}