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Galaxian.c:

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* separated amplifier Cin from mixer
* AY8910s numbering now in line with schematics
* Scramble sound not yet perfect, but levels improved significantly, Filters are difficult to model
This commit is contained in:
Couriersud 2009-02-26 09:32:04 +00:00
parent fb3e6c4b52
commit 1edddcdd69
1 changed files with 25 additions and 18 deletions
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43
src/mame/drivers/galaxian.c
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@ -337,24 +337,25 @@ static READ8_HANDLER( konami_ay8910_r )
{
/* the decoding here is very simplistic, and you can address both simultaneously */
UINT8 result = 0xff;
if (offset & 0x20) result &= ay8910_r(devtag_get_device(space->machine, SOUND, "8910.0"), 0);
if (offset & 0x80) result &= ay8910_r(devtag_get_device(space->machine, SOUND, "8910.1"), 0);
if (offset & 0x20) result &= ay8910_r(devtag_get_device(space->machine, SOUND, "8910.1"), 0);
if (offset & 0x80) result &= ay8910_r(devtag_get_device(space->machine, SOUND, "8910.0"), 0);
return result;
}
static WRITE8_HANDLER( konami_ay8910_w )
{
/* AV 4,5 ==> AY8910 #2 */
/* the decoding here is very simplistic, and you can address two simultaneously */
if (offset & 0x10)
ay8910_address_w(devtag_get_device(space->machine, SOUND, "8910.0"), 0, data);
else if (offset & 0x20)
ay8910_data_w(devtag_get_device(space->machine, SOUND, "8910.0"), 0, data);
if (offset & 0x40)
ay8910_address_w(devtag_get_device(space->machine, SOUND, "8910.1"), 0, data);
else if (offset & 0x80)
else if (offset & 0x20)
ay8910_data_w(devtag_get_device(space->machine, SOUND, "8910.1"), 0, data);
/* AV6,7 ==> AY8910 #1 */
if (offset & 0x40)
ay8910_address_w(devtag_get_device(space->machine, SOUND, "8910.0"), 0, data);
else if (offset & 0x80)
ay8910_data_w(devtag_get_device(space->machine, SOUND, "8910.0"), 0, data);
}
@ -415,6 +416,8 @@ static WRITE8_HANDLER( konami_sound_filter_w )
int which, chan;
/* the offset is used as data, 6 channels * 2 bits each */
/* AV0 .. AV5 ==> AY8910 #2 */
/* AV6 .. AV11 ==> AY8910 #1 */
for (which = 0; which < 2; which++)
if (devtag_get_device(space->machine, SOUND, ayname[which]) != NULL)
for (chan = 0; chan < 3; chan++)
@ -423,7 +426,7 @@ static WRITE8_HANDLER( konami_sound_filter_w )
/* low bit goes to 0.22uF capacitor = 220000pF */
/* high bit goes to 0.047uF capacitor = 47000pF */
discrete_sound_w(discrete, NODE(3 * (1-which) + chan + 11), bits);
discrete_sound_w(discrete, NODE(3 * which + chan + 11), bits);
}
}
@ -667,6 +670,7 @@ static READ8_HANDLER( frogger_ay8910_r )
static WRITE8_HANDLER( frogger_ay8910_w )
{
/* the decoding here is very simplistic */
/* AV6,7 ==> AY8910 #1 */
if (offset & 0x40)
ay8910_data_w(devtag_get_device(space->machine, SOUND, "8910.0"), 0, data);
else if (offset & 0x80)
@ -1569,8 +1573,8 @@ static const ay8910_interface konami_ay8910_interface_1 =
{
AY8910_DISCRETE_OUTPUT,
{RES_K(5.1), RES_K(5.1), RES_K(5.1)},
DEVCB_NULL,
DEVCB_NULL,
DEVCB_MEMORY_HANDLER("audiocpu", PROGRAM, soundlatch_r),
DEVCB_HANDLER(konami_sound_timer_r),
DEVCB_NULL,
DEVCB_NULL
};
@ -1579,8 +1583,8 @@ static const ay8910_interface konami_ay8910_interface_2 =
{
AY8910_DISCRETE_OUTPUT,
{RES_K(5.1), RES_K(5.1), RES_K(5.1)},
DEVCB_MEMORY_HANDLER("audiocpu", PROGRAM, soundlatch_r),
DEVCB_HANDLER(konami_sound_timer_r),
DEVCB_NULL,
DEVCB_NULL,
DEVCB_NULL,
DEVCB_NULL
};
@ -1642,7 +1646,7 @@ static const discrete_mixer_desc konami_sound_mixer_desc =
{0,0,0,0,0,0}, /* no node capacitors */
0, RES_K(2.2),
0,
CAP_U(0.15),
0, /* modelled separately */
0, 1};
static DISCRETE_SOUND_START( konami_sound )
@ -1677,7 +1681,10 @@ static DISCRETE_SOUND_START( konami_sound )
/* This is handled with sound_global_enable but */
/* belongs here. */
DISCRETE_OUTPUT(NODE_30, 12.0 )
/* Input impedance of a M51516L is typically 30k (datasheet) */
DISCRETE_CRFILTER(NODE_40,1,NODE_30,RES_K(30),CAP_U(0.15))
DISCRETE_OUTPUT(NODE_40, 10.0 )
DISCRETE_SOUND_END
@ -1745,9 +1752,9 @@ static MACHINE_DRIVER_START( konami_sound_1x_ay8910 )
/* sound hardware */
MDRV_SOUND_ADD("8910.0", AY8910, KONAMI_SOUND_CLOCK/8)
MDRV_SOUND_CONFIG(frogger_ay8910_interface)
MDRV_SOUND_ROUTE_EX(0, "konami", 1.0, 3)
MDRV_SOUND_ROUTE_EX(1, "konami", 1.0, 4)
MDRV_SOUND_ROUTE_EX(2, "konami", 1.0, 5)
MDRV_SOUND_ROUTE_EX(0, "konami", 1.0, 0)
MDRV_SOUND_ROUTE_EX(1, "konami", 1.0, 1)
MDRV_SOUND_ROUTE_EX(2, "konami", 1.0, 2)
MDRV_SOUND_ADD("konami", DISCRETE, 0)
MDRV_SOUND_CONFIG_DISCRETE(konami_sound)