MDFN_FASTCALL uint8 PCECD_Read(uint32 timestamp, uint32 A)
{
uint8 ret = 0;
if((A & 0x18c0) == 0x18c0)
{
switch (A & 0x18cf)
{
case 0x18c1: ret = 0xaa; break;
case 0x18c2: ret = 0x55; break;
case 0x18c3: ret = 0x00; break;
case 0x18c5: ret = 0xaa; break;
case 0x18c6: ret = 0x55; break;
case 0x18c7: ret = 0x03; break;
}
}
else
{
PCECD_Run(timestamp);
switch(A & 0xf)
{
case 0x0:
ret = 0;
ret |= PCECD_Drive_GetBSY() ? 0x80 : 0x00;
ret |= PCECD_Drive_GetREQ() ? 0x40 : 0x00;
ret |= PCECD_Drive_GetMSG() ? 0x20 : 0x00;
ret |= PCECD_Drive_GetCD() ? 0x10 : 0x00;
ret |= PCECD_Drive_GetIO() ? 0x08 : 0x00;
break;
case 0x1: ret = PCECD_Drive_GetDB();
break;
case 0x2: ret = _Port[2];
break;
case 0x3: bBRAMEnabled = false;
/* switch left/right of digitized cd playback */
ret = _Port[0x3];
_Port[0x3] ^= 2;
break;
case 0x4: ret = _Port[4];
break;
case 0x5: if(_Port[0x3] & 0x2)
ret = RawPCMVolumeCache[1] & 0xff; // Right
else
ret = RawPCMVolumeCache[0] & 0xff; // Left
break;
case 0x6: if(_Port[0x3] & 0x2)
ret = ((uint16)RawPCMVolumeCache[1]) >> 8; // Right
else
ret = ((uint16)RawPCMVolumeCache[0]) >> 8; // Left
break;
case 0x7:
if(SubChannelFIFO.CanRead() > 0)
ret = SubChannelFIFO.ReadByte();
else
ret = 0x00; // Not sure if it's 0, 0xFF, the last byte read, or something else.
if(SubChannelFIFO.CanRead() == 0)
{
_Port[0x3] &= ~0x10;
update_irq_state();
}
break;
case 0x8:
ret = read_1808(timestamp);
break;
case 0xa:
ADPCM_DEBUG("ReadBuffer\n");
ADPCM.ReadPending = 19 * 3; //24 * 3;
ret = ADPCM.ReadBuffer;
break;
case 0xb:
ret = _Port[0xb];
break;
case 0xc:
//printf("ADPCM Status Read: %d\n", timestamp);
ret = 0x00;
ret |= (ADPCM.EndReached) ? 0x01 : 0x00;
ret |= (ADPCM.Playing) ? 0x08 : 0x00;
ret |= (ADPCM.WritePending > 0) ? 0x04 : 0x00;
ret |= (ADPCM.ReadPending > 0) ? 0x80 : 0x00;
break;
case 0xd:
ret = ADPCM.LastCmd;
break;
}
}
uint8 PCECD_Read(uint32 A)
{
uint8 ret = 0;
if((A & 0x18c0) == 0x18c0)
{
switch (A & 0x18cf)
{
case 0x18c1: ret = 0xaa; break;
case 0x18c2: ret = 0x55; break;
case 0x18c3: ret = 0x00; break;
case 0x18c5: ret = 0xaa; break;
case 0x18c6: ret = 0x55; break;
case 0x18c7: ret = 0x03; break;
}
}
else switch(A & 0xf)
{
case 0x0:
ret = 0;
ret |= SCSICD_GetBSY() ? 0x80 : 0x00;
ret |= SCSICD_GetREQ() ? 0x40 : 0x00;
ret |= SCSICD_GetMSG() ? 0x20 : 0x00;
ret |= SCSICD_GetCD() ? 0x10 : 0x00;
ret |= SCSICD_GetIO() ? 0x08 : 0x00;
break;
case 0x1: ret = SCSICD_GetDB(); break;
case 0x2: ret = _Port[2]; break; //ret = _Port[2] & 0x7f; ret |= SCSICD_GetACK() ? 0x80 : 0x00; break;
case 0x3:
bBRAMEnabled = FALSE;
/* switch left/right of digitized cd playback */
ret = _Port[0x3];
if(!PCE_InDebug)
_Port[0x3] ^= 2;
break;
case 0x4: ret = _Port[4]; break;
case 0x5:
if(_Port[0x3] & 0x2)
ret = RawPCMVolumeCache[1]&0xff; // Right
else
ret = RawPCMVolumeCache[0]&0xff; // Left
break;
case 0x6:
if(_Port[0x3] & 0x2)
ret = ((uint16)RawPCMVolumeCache[1]) >> 8; // Right
else
ret = ((uint16)RawPCMVolumeCache[0]) >> 8; // Left
break;
case 0x7:
if(!PCE_InDebug)
{
_Port[0x3] &= ~0x10;
update_irq_state();
}
ret = SubChannelData;
break;
case 0x8:
ret = read_1808();
break;
case 0xa:
ret = ADPCM_ReadBuffer();
break;
case 0xb:
ret = _Port[0xb];
break;
case 0xc:
ret = 0x00;
ret |= ADPCM_IsPlaying() ? 0x8 : 0x1;
ret |= ADPCM_IsWritePending() ? 0x04 : 0x00;
ret |= ADPCM_IsBusyReading() ? 0x80 : 0x00;
break;
case 0xd:
ret = ADPCM_Read180D();
break;
}