diff options
author | 2009-11-17 13:34:30 +0000 | |
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committer | 2009-11-17 13:34:30 +0000 | |
commit | 0a647b65c9f7f97610433d0c8811ab217b917f8c (patch) | |
tree | d16530dda7dde0d702399aafa5c47b3d0d37b4d5 /src/emu/sound/sn76496.c | |
parent | ccefa6749d391b37d2f870c152578580ec3729e0 (diff) |
revert gamegear/sms psg change, was probably correct before, but need a better sample of the waveform to make sure.
Diffstat (limited to 'src/emu/sound/sn76496.c')
-rw-r--r-- | src/emu/sound/sn76496.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/src/emu/sound/sn76496.c b/src/emu/sound/sn76496.c index 187dcdfc4df..560ac865c18 100644 --- a/src/emu/sound/sn76496.c +++ b/src/emu/sound/sn76496.c @@ -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 } |