diff options
Diffstat (limited to 'src/mame/drivers/btime.c')
-rw-r--r-- | src/mame/drivers/btime.c | 32 |
1 files changed, 16 insertions, 16 deletions
diff --git a/src/mame/drivers/btime.c b/src/mame/drivers/btime.c index 2c4d0a44f6d..008463219d0 100644 --- a/src/mame/drivers/btime.c +++ b/src/mame/drivers/btime.c @@ -1341,7 +1341,7 @@ static const discrete_mixer_desc btime_sound_mixer_desc = 0, /* Modelled separately */ 0, 1}; -/* R49 has 4.7k in schematics, but listed as 47k in bill of material +/* R49 has 4.7k in schematics, but listed as 47k in bill of material * 47k gives proper low pass filtering */ #define BTIME_R49 RES_K(47) @@ -1352,16 +1352,16 @@ static const discrete_mixer_desc btime_sound_mixer_desc = * * With R51 being 1K, the gain is way to high (23.5). Therefore R51 * is set to 5k, but this is a hack. With the modification, - * sound levels are in line with observations. + * sound levels are in line with observations. * FIXME: Verify R51,R50,R52 and R49 on real pcb - * + * * http://www.coinopvideogames.com/videogames01.php - * There are two recordings from 1982 where the filtered sound is way louder + * There are two recordings from 1982 where the filtered sound is way louder * than the music. There is a later recording * http://www.coinopvideogames.com/videogames03.php * in which the filtered sounds have volumes closer to the music. - * - */ + * + */ #define BTIME_R52 RES_K(1) #define BTIME_R51 RES_K(5) /* schematics 1k */ @@ -1390,17 +1390,17 @@ static DISCRETE_SOUND_START( btime_sound ) DISCRETE_MIXER2(NODE_40, 1, NODE_22, NODE_30, &btime_sound_mixer_desc) DISCRETE_CRFILTER(NODE_41, 1, NODE_40, RES_K(10), CAP_U(10)) - + /* Amplifier is upc1181H3 - * - * http://www.mydarc.de/dj7oh/fad/ics/upc1181/upc1181.htm - * - * A linear frequency response is mentioned as well as a lower - * edge frequency determined by cap on pin3, however no formula given. - * - * not modelled here - */ - + * + * http://www.mydarc.de/dj7oh/fad/ics/upc1181/upc1181.htm + * + * A linear frequency response is mentioned as well as a lower + * edge frequency determined by cap on pin3, however no formula given. + * + * not modelled here + */ + /* Assuming a 4 Ohm impedance speaker */ DISCRETE_CRFILTER(NODE_43, 1, NODE_41, 3.0, CAP_U(100)) |