static bool Tandy_InitializeSB() {
/* see if soundblaster module available and at what port/IRQ/DMA */
Bitu sbport, sbirq, sbdma;
if (SB_Get_Address(sbport, sbirq, sbdma)) {
tandy_sb.port=(Bit16u)(sbport&0xffff);
tandy_sb.irq =(Bit8u)(sbirq&0xff);
tandy_sb.dma =(Bit8u)(sbdma&0xff);
return true;
} else {
/* no soundblaster accessible, disable Tandy DAC */
tandy_sb.port=0;
return false;
}
}
TANDYSOUND(Section* configuration):Module_base(configuration){
Section_prop * section=static_cast<Section_prop *>(configuration);
bool enable_hw_tandy_dac=true;
Bitu sbport, sbirq, sbdma;
if (SB_Get_Address(sbport, sbirq, sbdma)) {
enable_hw_tandy_dac=false;
}
//Select the correct tandy chip implementation
if (machine == MCH_PCJR) activeDevice = &device_sn76496;
else activeDevice = &device_ncr8496;
real_writeb(0x40,0xd4,0x00);
if (IS_TANDY_ARCH) {
/* enable tandy sound if tandy=true/auto */
if ((strcmp(section->Get_string("tandy"),"true")!=0) &&
(strcmp(section->Get_string("tandy"),"on")!=0) &&
(strcmp(section->Get_string("tandy"),"auto")!=0)) return;
} else {
/* only enable tandy sound if tandy=true */
if ((strcmp(section->Get_string("tandy"),"true")!=0) &&
(strcmp(section->Get_string("tandy"),"on")!=0)) return;
/* ports from second DMA controller conflict with tandy ports */
CloseSecondDMAController();
if (enable_hw_tandy_dac) {
WriteHandler[2].Install(0x1e0,SN76496Write,IO_MB,2);
WriteHandler[3].Install(0x1e4,TandyDACWrite,IO_MB,4);
// ReadHandler[3].Install(0x1e4,TandyDACRead,IO_MB,4);
}
}
Bit32u sample_rate = section->Get_int("tandyrate");
tandy.chan=MixerChan.Install(&SN76496Update,sample_rate,"TANDY");
WriteHandler[0].Install(0xc0,SN76496Write,IO_MB,2);
if (enable_hw_tandy_dac) {
// enable low-level Tandy DAC emulation
WriteHandler[1].Install(0xc4,TandyDACWrite,IO_MB,4);
ReadHandler[1].Install(0xc4,TandyDACRead,IO_MB,4);
tandy.dac.enabled=true;
tandy.dac.chan=MixerChanDAC.Install(&TandyDACUpdate,sample_rate,"TANDYDAC");
tandy.dac.hw.base=0xc4;
tandy.dac.hw.irq =7;
tandy.dac.hw.dma =1;
} else {
tandy.dac.enabled=false;
tandy.dac.hw.base=0;
tandy.dac.hw.irq =0;
tandy.dac.hw.dma =0;
}
tandy.dac.control=0;
tandy.dac.mode =0;
tandy.dac.irq_activated=false;
tandy.dac.frequency=0;
tandy.dac.amplitude=0;
tandy.dac.dma.last_sample=0;
tandy.enabled=false;
real_writeb(0x40,0xd4,0xff); /* BIOS Tandy DAC initialization value */
((device_t&)device).device_start();
device.convert_samplerate(sample_rate);
}
