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Support 2nd SSI263 at $Cn20

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Phasor doesn't support reading AY8913 regs
This commit is contained in:
tomcw 2021-02-21 19:12:36 +00:00
parent 2cd2f013e6
commit 2d086e87ec
1 changed files with 24 additions and 12 deletions
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36
source/Mockingboard.cpp
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@ -332,7 +332,10 @@ static void AY8910_Write(BYTE nDevice, BYTE /*nReg*/, BYTE nValue, BYTE nAYDevic
break;
case AY_READ: // 5: READ FROM PSG (need to set DDRA to input)
pMB->sy6522.ORA = AYReadReg(nDevice+2*nAYDevice, pMB->nAYCurrentRegister) & (pMB->sy6522.DDRA ^ 0xff);
if (g_bPhasorEnable)
pMB->sy6522.ORA = 0xff & (pMB->sy6522.DDRA ^ 0xff); // Phasor doesn't support reading AY8913s - it just reads 1's for the input bits
else
pMB->sy6522.ORA = AYReadReg(nDevice+2*nAYDevice, pMB->nAYCurrentRegister) & (pMB->sy6522.DDRA ^ 0xff);
break;
case AY_WRITE: // 6: WRITE TO PSG
@ -584,8 +587,9 @@ static void UpdateIFR(SY6522_AY8910* pMB, BYTE clr_ifr, BYTE set_ifr=0)
bIRQ |= g_MB[i].sy6522.IFR & 0x80;
// NB. Mockingboard generates IRQ on both 6522s:
// . SSI263's IRQ (A/!R) is routed via the 2nd 6522 (at $Cx80) and must generate a 6502 IRQ (not NMI)
// . SC-01's IRQ (A/!R) is also routed via a (2nd?) 6522
// . SSI263's IRQ (A/!R) is routed via the 2nd 6522 (at $Cn80) and must generate a 6502 IRQ (not NMI)
// - NB. 2nd SSI263's IRQ is routed via the 1st 6522 (at $Cn00) and again generates a 6502 IRQ
// . SC-01's IRQ (A/!R) is routed via the 6522 at $Cn00 (NB. Only the Mockingboard "Sound/Speech I" card supports the SC-01)
// Phasor's SSI263 IRQ (A/!R) line is *also* wired directly to the 6502's IRQ (as well as the 6522's CA1)
if (bIRQ)
@ -1906,10 +1910,15 @@ static BYTE __stdcall MB_Read(WORD PC, WORD nAddr, BYTE bWrite, BYTE nValue, ULO
bool bAccessedDevice = (CS & 3) ? true : false;
if ((g_phasorMode == PH_Phasor) && ((nAddr & 0xD0) == 0x40)) // $Cn4x and $Cn6x (Mockingboard mode: SSI263.bit7 not readable)
bool CS_SSI263 = !(nAddr & 0x80) && (nAddr & 0x60); // SSI263 at $Cn2x and/or $Cn4x
if (g_phasorMode == PH_Phasor && CS_SSI263) // NB. Mockingboard mode: SSI263.bit7 not readable
{
_ASSERT(!bAccessedDevice);
nRes = SSI263_Read(nMB*2+1, nExecutedCycles); // SSI263 only drives bit7
if (nAddr & 0x40) // Primary SSI263
nRes = SSI263_Read(nMB*2+1, nExecutedCycles); // SSI263 only drives bit7
if (nAddr & 0x20) // Secondary SSI263
nRes = SSI263_Read(nMB*2+0, nExecutedCycles); // SSI263 only drives bit7
bAccessedDevice = true;
}
@ -1995,15 +2004,16 @@ static BYTE __stdcall MB_Write(WORD PC, WORD nAddr, BYTE bWrite, BYTE nValue, UL
if(CS & 2)
SY6522_Write(nMB*NUM_DEVS_PER_MB + SY6522_DEVICE_B, nAddr&0xf, nValue);
int CS_SSI263 = (g_phasorMode == PH_Mockingboard) ? (nAddr & 0xE0) == 0x40 // Mockingboard: $Cn4x
: (g_phasorMode == PH_Phasor) ? (nAddr & 0xC0) == 0x40 // Phasor: $Cn4x and $Cn6x
: 0; // Echo+
bool CS_SSI263 = !(nAddr & 0x80) && (nAddr & 0x60); // SSI263 at $Cn2x and/or $Cn4x
if (CS_SSI263)
if ((g_phasorMode == PH_Mockingboard || g_phasorMode == PH_Phasor) && CS_SSI263) // No SSI263 for Echo+
{
// NB. Mockingboard mode: writes to $Cn4x/SSI263 also get written to 1st 6522 (have confirmed on real Phasor h/w)
_ASSERT( (g_phasorMode == PH_Mockingboard && (CS==0 || CS==1)) || (g_phasorMode == PH_Phasor && (CS==0)) );
SSI263_Write(nMB*2+1, nAddr&0x7, nValue); // Second 6522 is used for speech chip
if (nAddr & 0x40) // Primary SSI263
SSI263_Write(nMB*2+1, nAddr&0x7, nValue); // 2nd 6522 is used for 1st speech chip
if (nAddr & 0x20) // Secondary SSI263
SSI263_Write(nMB*2+0, nAddr&0x7, nValue); // 1st 6522 is used for 2nd speech chip
}
return 0;
@ -2014,8 +2024,10 @@ static BYTE __stdcall MB_Write(WORD PC, WORD nAddr, BYTE bWrite, BYTE nValue, UL
else
SY6522_Write(nMB*NUM_DEVS_PER_MB + SY6522_DEVICE_B, nAddr&0xf, nValue);
if ((nOffset >= SSI263_Offset) && (nOffset <= (SSI263_Offset+0x07)))
SSI263_Write(nMB*2+1, nAddr&0x7, nValue); // Second 6522 is used for speech chip -- TODO confirm with real MB h/w that writes go to 1st 6522
if (nAddr & 0x40)
SSI263_Write(nMB*2+1, nAddr&0x7, nValue); // 2nd 6522 is used for 1st speech chip
if (nAddr & 0x20)
SSI263_Write(nMB*2+0, nAddr&0x7, nValue); // 1st 6522 is used for 2nd speech chip
return 0;
}