SEGA SATURN DEVELOPER'S MANUAL

No PCM stream sound

After starting the sound driver, issue the PCM start (85h) command with the following parameters. You should get a square wave sound. There is no need to prepare PCM waveform data.

If sound is output by this, the parameter setting value is invalid or the PCM data is invalid. If no sound is output, check the following:

symptom	cause
No PCM stream sound	□ Check external connection to the speaker, volume, etc.
	□ Checking the sound driver operation Check if the sound driver is operating. Please refer to "Symptom: No sound" in the previous section.
	□ Checking the sound driver version ASCII from the 1010h address of the sound memory (SH address 25A01010h) Version is registered.
	□ Is the target PCM data correctly transferred to the sound memory? Note that the command parameters P3 and P4 specify only the upper 16 bits in the 20 bits of the PCM playback start address. Example) When P3 = 12h, P4 = 34h, the actual address is 12340h (25A12340h).
	□ Is the master volume of the sound source set to -∞dB (Volume = Off)? Please try to write 0Fh (−0dB: Volume = maximum) to byte 100401h (SH address 25B00401h) of sound memory. 註: Cannot read
	□ Is the PCM volume parameter P2 setting of the command correct? 註: bit7,6,5 = volume, bit4,3,2,1,0 = PAN P2 = E0H (volume = Max, PAN = Center) P2 = C0H (volume = -6dB) , PAN = Center) \| P2 = 00H (Volume = -∞dB, PAN = Center)
	□ Are the pitch parameters P7 and P8 set correctly? Bit7 and bit2 of P7 are prohibited (fixed to “0”). If P7 = 00H and P8 = 00H, it will be played at 44.1kHz.