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pc9801_86: add clocks (nw)

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This commit is contained in:
cracyc 2018-04-13 09:48:53 -05:00
parent 1ae9ad10e4
commit 88bcdb4a50
3 changed files with 7 additions and 5 deletions
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7
src/devices/bus/cbus/pc9801_86.cpp
View File

@ -20,7 +20,6 @@
#include "sound/volt_reg.h"
#include "speaker.h"
#define MAIN_CLOCK_X1 XTAL(1'996'800)
#define QUEUE_SIZE 32768
//**************************************************************************
@ -55,7 +54,7 @@ WRITE_LINE_MEMBER(pc9801_86_device::sound_irq)
MACHINE_CONFIG_START(pc9801_86_device::device_add_mconfig)
MCFG_SPEAKER_STANDARD_STEREO("lspeaker", "rspeaker")
MCFG_SOUND_ADD("opna", YM2608, MAIN_CLOCK_X1*4) // unknown clock / divider
MCFG_SOUND_ADD("opna", YM2608, 7.987_MHz_XTAL)
MCFG_YM2608_IRQ_HANDLER(WRITELINE(pc9801_86_device, sound_irq))
MCFG_AY8910_PORT_A_READ_CB(READ8(pc9801_86_device, opn_porta_r))
//MCFG_AY8910_PORT_B_READ_CB(READ8(pc9801_state, opn_portb_r))
@ -252,8 +251,8 @@ READ8_MEMBER(pc9801_86_device::pcm_r)
WRITE8_MEMBER(pc9801_86_device::pcm_w)
{
const int rate = 44100*3; // TODO : unknown clock / divider
const int divs[8] = {3, 4, 6, 8, 12, 16, 24, 32};
const u32 rate = (25.4_MHz_XTAL).value() / 16;
const int divs[8] = {36, 48, 72, 96, 144, 192, 288, 384};
if((offset & 1) == 0)
{
switch(offset >> 1)

2
src/devices/bus/isa/sb16.cpp
View File

@ -108,7 +108,7 @@ void sb16_lle_device::control_timer(bool start)
{
if(start && m_freq)
{
double rate = (46615120.0/1024/256) * m_freq;
double rate = ((46.61512_MHz_XTAL).dvalue()/1024/256) * m_freq;
m_timer->adjust(attotime::from_hz(rate), 0, attotime::from_hz(rate));
}
else

3
src/emu/xtal.cpp
View File

@ -117,6 +117,7 @@ const double XTAL::known_xtals[] = {
7'159'090, /* 7.15909_MHz_XTAL Blood Bros (2x NTSC subcarrier) */
7'372'800, /* 7.3728_MHz_XTAL - */
7'864'300, /* 7.8643_MHz_XTAL Used on InterFlip games as video clock */
7'987'000, /* 7.987_MHz_XTAL PC9801-86 YM2608 clock */
8'000'000, /* 8_MHz_XTAL Extremely common, used on 100's of PCBs */
8'200'000, /* 8.2_MHz_XTAL Universal Mr. Do - Model 8021 PCB */
8'388'000, /* 8.388_MHz_XTAL Nintendo Game Boy Color */
@ -255,6 +256,7 @@ const double XTAL::known_xtals[] = {
25'174'800, /* 25.1748_MHz_XTAL Sega System 16A/16B (1600x NTSC line rate) */
25'200'000, /* 25.2_MHz_XTAL Tektronix 4404 video clock */
25'398'360, /* 25.39836_MHz_XTAL Tandberg TDV 2324 */
25'400'000, /* 25.4_MHz_XTAL PC9801-86 PCM base clock */
25'447'000, /* 25.447_MHz_XTAL Namco EVA3A (Funcube2) */
25'590'906, /* 25.590906_MHz_XTAL Atari Jaguar NTSC */
25'593'900, /* 25.5939_MHz_XTAL Atari Jaguar PAL */
@ -315,6 +317,7 @@ const double XTAL::known_xtals[] = {
45'158'000, /* 45.158_MHz_XTAL Sega Model 2A video board, Model 3 CPU board */
45'619'200, /* 45.6192_MHz_XTAL DEC VK100 */
45'830'400, /* 45.8304_MHz_XTAL Microterm 5510 */
46'615'120, /* 46.61512_Mhz_XTAL Soundblaster 16 PCM base clock */
47'736'000, /* 47.736_MHz_XTAL Visual 100 */
48'000'000, /* 48_MHz_XTAL Williams/Midway Y/Z-unit system / SSV board */
48'384'000, /* 48.384_MHz_XTAL Namco NB-1 */