Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-05-25 07:15:25 +03:00
Code Issues Actions Packages Projects Releases Wiki Activity

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

Browse Source
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
src/emu/sound/sn76496.c
View File

@ -61,7 +61,7 @@
16/11/2009 : Lord Nightmare 16/11/2009 : Lord Nightmare
Fix screeching in regulus: When summing together four equal channels, the 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 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. TODO: * Implement a function for setting stereo regs for the game gear.
Requires making the core support both mono and stereo, and have 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, * Test the NCR7496; Smspower says the whitenoise taps are A and E,
but this needs verification on real hardware. but this needs verification on real hardware.
* Test the SMS PSG/Gamegear PSG to see whether it uses XOR or XNOR * 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. * Factor out common code so that the SAA1099 can share some code.
***************************************************************************/ ***************************************************************************/
@ -400,12 +400,12 @@ static DEVICE_START( ncr7496 )
static DEVICE_START( gamegear ) 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 ) 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
} }