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Partly implemented 'stereo' gating (using ym2151 ctX lines) to POKEY and TMS5220 on Atari JSA-i sound board. (currently it is just 'mono' gating). Add TODOs for complete stereo gating and for the low-pass filter. [Lord Nightmare]

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This commit is contained in:
Jonathan Gevaryahu 2010-04-18 09:19:59 +00:00
parent 389bc727b3
commit 1144153765
1 changed files with 23 additions and 3 deletions
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26
src/mame/audio/atarijsa.c
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@ -28,6 +28,13 @@ Effects 2C00-2C0F R/W D0-D7
Banked Program ROM (4 pages) 3000-3FFF R D0-D7
Static Program ROM (48K bytes) 4000-FFFF R D0-D7
TODO:
JSA-i: stereo gating for POKEY/TMS5220C is currently only mono, only looking at ym2151_ct1;
the two commented-out lines would be correct if stereo volume-set functions were written.
ALL: the LPF (low pass filter) bit which selectively places a lowpass filter in the output
path for all channels is currently unimplemented; someone who knows analog magic will need
to handle this.
****************************************************************************/
#include "emu.h"
@ -61,6 +68,8 @@ static UINT8 pokey_volume;
static UINT8 ym2151_volume;
static UINT8 tms5220_volume;
static UINT8 oki6295_volume;
static UINT8 ym2151_ct1;
static UINT8 ym2151_ct2;
static void update_all_volumes(running_machine *machine);
@ -177,6 +186,8 @@ void atarijsa_reset(void)
ym2151_volume = 100;
tms5220_volume = 100;
oki6295_volume = 100;
ym2151_ct1 = 0;
ym2151_ct2 = 0;
/* Guardians of the Hood assumes we're reset to bank 0 on startup */
memcpy(bank_base, &bank_source_data[0x0000], 0x1000);
@ -705,6 +716,12 @@ static WRITE8_HANDLER( jsa3s_io_w )
}
}
static WRITE8_DEVICE_HANDLER( ym2151_ctl_w )
{
ym2151_ct1 = data&0x1;
ym2151_ct2 = (data&0x2)>>1;
update_all_volumes(device->machine);
}
/*************************************
@ -715,9 +732,11 @@ static WRITE8_HANDLER( jsa3s_io_w )
static void update_all_volumes(running_machine *machine )
{
if (pokey != NULL) atarigen_set_pokey_vol(machine, overall_volume * pokey_volume / 100);
if (pokey != NULL) atarigen_set_pokey_vol(machine, (overall_volume * pokey_volume / 100) * ym2151_ct1);
//if (pokey != NULL) atarigen_set_pokey_stereo_vol(machine, (overall_volume * pokey_volume / 100) * ym2151_ct1, (overall_volume * pokey_volume / 100) * ym2151_ct2);
if (ym2151 != NULL) atarigen_set_ym2151_vol(machine, overall_volume * ym2151_volume / 100);
if (tms5220 != NULL) atarigen_set_tms5220_vol(machine, overall_volume * tms5220_volume / 100);
if (tms5220 != NULL) atarigen_set_tms5220_vol(machine, (overall_volume * tms5220_volume / 100) * ym2151_ct1);
//if (tms5220 != NULL) atarigen_set_tms5220_stereo_vol(machine, (overall_volume * tms5220_volume / 100) * ym2151_ct1, (overall_volume * tms5220_volume / 100) * ym2151_ct2);
if (oki6295 != NULL || oki6295_l != NULL || oki6295_r != NULL) atarigen_set_oki6295_vol(machine, overall_volume * oki6295_volume / 100);
}
@ -771,7 +790,8 @@ ADDRESS_MAP_END
static const ym2151_interface ym2151_config =
{
atarigen_ym2151_irq_gen
atarigen_ym2151_irq_gen,
ym2151_ctl_w
};