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revert gamegear/sms psg change, was probably correct before, but need a better sample of the waveform to make sure.

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This commit is contained in:
Jonathan Gevaryahu 2009-11-17 13:34:30 +00:00
parent ccefa6749d
commit 0a647b65c9
1 changed files with 4 additions and 4 deletions
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8
src/emu/sound/sn76496.c
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@ -61,7 +61,7 @@
16/11/2009 : Lord Nightmare
Fix screeching in regulus: When summing together four equal channels, the
size of the max amplitude per channel should be 1/4 of the max range, not
1/3. Added NCR7496. Changed sega psg/gamegear from XNOR to XOR.
1/3. Added NCR7496.
TODO: * Implement a function for setting stereo regs for the game gear.
Requires making the core support both mono and stereo, and have
@ -75,7 +75,7 @@
* Test the NCR7496; Smspower says the whitenoise taps are A and E,
but this needs verification on real hardware.
* Test the SMS PSG/Gamegear PSG to see whether it uses XOR or XNOR
taps.
taps. (17/11/2009: this seems to be XNOR? Need a better sample.)
* Factor out common code so that the SAA1099 can share some code.
***************************************************************************/
@ -400,12 +400,12 @@ static DEVICE_START( ncr7496 )
static DEVICE_START( gamegear )
{
generic_start(device, 0x8000, 0x09, FALSE); // todo: verify; from smspower wiki
generic_start(device, 0x8000, 0x09, TRUE); // semi-verified by Lord Nightmare, need better sample
}
static DEVICE_START( smsiii )
{
generic_start(device, 0x8000, 0x09, FALSE); // todo: verify; from smspower wiki
generic_start(device, 0x8000, 0x09, TRUE); // todo: verify; from smspower wiki, assumed to have same invert as gamegear
}