/**
* Write byte to 0xff8803. Set content of YM's data register under conditions.
* Address 0xff8803 is a shadow version of 0xff8802, so both addresses can't be written
* at the same time by the same instruction. This means only a .B access or
* a movep will have a valid effect, other accesses are ignored.
*/
void PSG_ff8803_WriteByte(void)
{
if ( nIoMemAccessSize == SIZE_BYTE ) /* byte access or movep */
{
M68000_WaitState(1); /* [NP] FIXME not 100% accurate, but gives good results */
if (LOG_TRACE_LEVEL(TRACE_PSG_WRITE))
{
int FrameCycles, HblCounterVideo, LineCycles;
Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
LOG_TRACE_PRINT("ym write %x=0x%x video_cyc=%d %d@%d pc=%x instr_cycle %d\n",
IoAccessCurrentAddress, IoMem[IoAccessCurrentAddress],
FrameCycles, LineCycles, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles);
}
PSG_Set_DataRegister ( IoMem[IoAccessCurrentAddress] );
}
else
{ /* do nothing, just a trace if needed */
if (LOG_TRACE_LEVEL(TRACE_PSG_WRITE))
{
int FrameCycles, HblCounterVideo, LineCycles;
Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
LOG_TRACE_PRINT("ym write ignored %x=0x%x video_cyc=%d %d@%d pc=%x instr_cycle %d\n",
IoAccessCurrentAddress, IoMem[IoAccessCurrentAddress],
FrameCycles, LineCycles, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles);
}
}
}
/**
* Default information on entering the debugger
*/
static void DebugInfo_Default(Uint32 dummy)
{
int hbl, fcycles, lcycles;
Video_GetPosition(&fcycles, &hbl, &lcycles);
fprintf(stderr, "\nCPU=$%x, VBL=%d, FrameCycles=%d, HBL=%d, LineCycles=%d, DSP=",
M68000_GetPC(), 0, fcycles, hbl, lcycles);
fprintf(stderr, "N/A\n");
}
/**
* Read byte from 0xff8801/02/03. Return 0xff.
*/
void PSG_ff880x_ReadByte(void)
{
M68000_WaitState(1); /* [NP] FIXME not 100% accurate, but gives good results */
IoMem[IoAccessCurrentAddress] = 0xff;
if (LOG_TRACE_LEVEL(TRACE_PSG_READ))
{
int FrameCycles, HblCounterVideo, LineCycles;
Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
LOG_TRACE_PRINT("ym read void %x=0x%x video_cyc=%d %d@%d pc=%x instr_cycle %d\n",
IoAccessCurrentAddress, IoMem[IoAccessCurrentAddress],
FrameCycles, LineCycles, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles);
}
}
/**
* Write byte to 0xff8802. Set content of YM's data register.
*/
void PSG_ff8802_WriteByte(void)
{
// M68000_WaitState(4);
M68000_WaitState(1); /* [NP] FIXME not 100% accurate, but gives good results */
if (LOG_TRACE_LEVEL(TRACE_PSG_WRITE))
{
int FrameCycles, HblCounterVideo, LineCycles;
Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
LOG_TRACE_PRINT("ym write %x=0x%x video_cyc=%d %d@%d pc=%x instr_cycle %d\n",
IoAccessCurrentAddress, IoMem[IoAccessCurrentAddress],
FrameCycles, LineCycles, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles);
}
PSG_Set_DataRegister ( IoMem[IoAccessCurrentAddress] );
}
/**
* Write byte to the YM address register (usually 0xff8800). This is used
* as a selector for when we read/write the YM data register (0xff8802).
*/
void PSG_Set_SelectRegister(Uint8 val)
{
/* Store register used to read/write in $ff8802. This register */
/* is 8 bits on the YM2149, this means it should not be masked */
/* with 0xf. Instead, we keep the 8 bits, but we must ignore */
/* read/write to ff8802 when PSGRegisterSelect >= 16 */
PSGRegisterSelect = val;
/* When address register is changed, a read from $ff8800 should */
/* return the masked value of the register. We set the value here */
/* to be returned in case PSG_Get_DataRegister is called */
PSGRegisterReadData = PSGRegisters[PSGRegisterSelect];
if (LOG_TRACE_LEVEL(TRACE_PSG_WRITE))
{
int FrameCycles, HblCounterVideo, LineCycles;
Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
LOG_TRACE_PRINT("ym write reg=0x%x video_cyc=%d %d@%d pc=%x instr_cycle %d\n",
PSGRegisterSelect, FrameCycles, LineCycles, HblCounterVideo,
M68000_GetPC(), CurrentInstrCycles);
}
}
/**
* Reset variables used in PSG
*/
void PSG_Reset(void)
{
int i;
if (LOG_TRACE_LEVEL(TRACE_PSG_WRITE))
{
int FrameCycles, HblCounterVideo, LineCycles;
Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
LOG_TRACE_PRINT("ym reset video_cyc=%d %d@%d pc=%x instr_cycle %d\n",
FrameCycles, LineCycles, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles);
}
PSGRegisterSelect = 0;
PSGRegisterReadData = 0;
memset(PSGRegisters, 0, sizeof(PSGRegisters));
PSGRegisters[PSG_REG_IO_PORTA] = 0xff; /* no drive selected + side 0 after a reset */
/* Update sound's emulation registers */
for ( i=0 ; i < NUM_PSG_SOUND_REGISTERS; i++ )
Sound_WriteReg ( i , 0 );
LastStrobe=0;
}
/**
* Write byte to YM's register (0xff8802), store according to PSG select register (0xff8800)
*/
void PSG_Set_DataRegister(Uint8 val)
{
if (LOG_TRACE_LEVEL(TRACE_PSG_WRITE))
{
int FrameCycles, HblCounterVideo, LineCycles;
Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
LOG_TRACE_PRINT("ym write data reg=0x%x val=0x%x video_cyc=%d %d@%d pc=%x instr_cycle %d\n",
PSGRegisterSelect, val, FrameCycles, LineCycles,
HblCounterVideo, M68000_GetPC(), CurrentInstrCycles);
}
/* Is a valid PSG register currently selected ? */
if ( PSGRegisterSelect >= MAX_PSG_REGISTERS )
return; /* not valid, ignore write and do nothing */
/* Create samples up until this point with current values */
Sound_Update(false);
/* When a read is made from $ff8800 without changing PSGRegisterSelect, we should return */
/* the non masked value. */
PSGRegisterReadData = val; /* store non masked value for PSG_Get_DataRegister */
/* Copy value to PSGRegisters[] */
PSGRegisters[PSGRegisterSelect] = val;
/* Clear unused bits for some regs */
if ( ( PSGRegisterSelect == PSG_REG_CHANNEL_A_COARSE ) || ( PSGRegisterSelect == PSG_REG_CHANNEL_B_COARSE )
|| ( PSGRegisterSelect == PSG_REG_CHANNEL_C_COARSE ) || ( PSGRegisterSelect == PSG_REG_ENV_SHAPE ) )
PSGRegisters[PSGRegisterSelect] &= 0x0f; /* only keep bits 0 - 3 */
else if ( ( PSGRegisterSelect == PSG_REG_CHANNEL_A_AMP ) || ( PSGRegisterSelect == PSG_REG_CHANNEL_B_AMP )
|| ( PSGRegisterSelect == PSG_REG_CHANNEL_C_AMP ) || ( PSGRegisterSelect == PSG_REG_NOISE_GENERATOR ) )
PSGRegisters[PSGRegisterSelect] &= 0x1f; /* only keep bits 0 - 4 */
if ( PSGRegisterSelect < NUM_PSG_SOUND_REGISTERS )
{
/* Copy sound related registers 0..13 to the sound module's internal buffer */
Sound_WriteReg ( PSGRegisterSelect , PSGRegisters[PSGRegisterSelect] );
}
else if ( PSGRegisterSelect == PSG_REG_IO_PORTA )
{
/*
* FIXME: This is only a prelimary dirty hack!
* Port B (Printer port) - writing here needs to be dispatched to the printer
* STROBE (Port A bit5) does a short LOW and back to HIGH when the char is valid
* To print you need to write the character byte to IOB and you need to toggle STROBE
* (like EmuTOS does).
*/
/* Printer dispatching only when printing is activated */
if (ConfigureParams.Printer.bEnablePrinting)
{
/* Bit 5 - Centronics strobe? If STROBE is low and the LastStrobe was high,
then print/transfer to the emulated Centronics port.
*/
if (LastStrobe && ( (PSGRegisters[PSG_REG_IO_PORTA]&(1<<5)) == 0 ))
{
/* Seems like we want to print something... */
Printer_TransferByteTo(PSGRegisters[PSG_REG_IO_PORTB]);
/* Initiate a possible GPIP0 Printer BUSY interrupt */
MFP_InputOnChannel ( MFP_INT_GPIP0 , 0 );
/* Initiate a possible GPIP1 Falcon ACK interrupt */
if (ConfigureParams.System.nMachineType == MACHINE_FALCON)
MFP_InputOnChannel ( MFP_INT_GPIP1 , 0 );
}
}
LastStrobe = PSGRegisters[PSG_REG_IO_PORTA]&(1<<5);
/* Bit 0-2 : side and drive select */
if ( (PSGRegisters[PSG_REG_IO_PORTA]&(1<<1)) == 0 )
{
/* floppy drive A is ON */
Statusbar_SetFloppyLed(DRIVE_LED_A, LED_STATE_ON);
}
else
{
Statusbar_SetFloppyLed(DRIVE_LED_A, LED_STATE_OFF);
}
if ( (PSGRegisters[PSG_REG_IO_PORTA]&(1<<2)) == 0 )
{
/* floppy drive B is ON */
Statusbar_SetFloppyLed(DRIVE_LED_B, LED_STATE_ON);
}
else
{
Statusbar_SetFloppyLed(DRIVE_LED_B, LED_STATE_OFF);
}
/* Bit 3 - Centronics as input */
if(PSGRegisters[PSG_REG_IO_PORTA]&(1<<3))
{
/* FIXME: might be needed if we want to emulate sound sampling hardware */
}
/* handle Falcon specific bits in PORTA of the PSG */
if (ConfigureParams.System.nMachineType == MACHINE_FALCON)
{
/* Bit 4 - DSP reset? */
if(PSGRegisters[PSG_REG_IO_PORTA]&(1<<4))
{
Log_Printf(LOG_DEBUG, "Calling DSP_Reset?\n");
#if ENABLE_DSP_EMU
if (ConfigureParams.System.nDSPType == DSP_TYPE_EMU) {
DSP_Reset();
}
#endif
}
/* Bit 6 - Internal Speaker control */
if(PSGRegisters[PSG_REG_IO_PORTA]&(1<<6))
{
/*Log_Printf(LOG_DEBUG, "Falcon: Internal Speaker state\n");*/
/* FIXME: add code to handle? (if we want to emulate the speaker at all? */
}
/* Bit 7 - Reset IDE? */
if(PSGRegisters[PSG_REG_IO_PORTA]&(1<<7))
{
Log_Printf(LOG_DEBUG, "Falcon: Reset IDE subsystem\n");
/* FIXME: add code to handle IDE reset */
}
}
}
}