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- Added 73.728MHz crystal to xtal.h

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- Added clock #define's to 20pacgal.c
- Minor formatting clean-up
This commit is contained in:
Zsolt Vasvari 2008-01-31 00:50:52 +00:00
parent 3a5232a03c
commit 887823ae97
2 changed files with 18 additions and 9 deletions
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2
src/emu/drivers/xtal.h
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@ -122,7 +122,7 @@ enum
XTAL_61_44MHz = 61440000, /* dkong */
XTAL_64MHz = 64000000, /* BattleToads */
XTAL_66_6667MHz = 66666700, /* later Midway games */
XTAL_67_7376MHz = 67737600, /* PSX-based h/w, Sony ZN1-2-based */
XTAL_73_728MHz = 73728000, /* Ms. Pac-Man/Galaga 20th Anniversary */
XTAL_100MHz = 100000000, /* PSX-based Namco System 12, Vegas, Sony ZN1-2-based */
XTAL_101_4912MHz = 101491200, /* PSX-based Namco System 10 */

25
src/mame/drivers/20pacgal.c
View File

@ -17,20 +17,17 @@
(c) 2000 Cosmodog, Ltd.
>
and it listens for incoming characters.
* CPU is a Z8S18020VSC (20MHz part), OSC is 73.728MHz
Known issues/to-do's:
* Crashed on reset - Z180 core problem?
* Crashes on reset - Z180 core problem?
* ROM banking is not understood. Shouldn't require copying and other
trickey
* Starfield missing
* Check the ASCI interface, there probably is fully working debug code.
* The timed interrupt is a kludge; it is supposed to be generated internally by
the Z180, but the cpu core doesn't support that yet.
* Correct CPU speed... Zilog says Z180 comes in 6, 8, 10, 20 & 33MHz.
20MHz is used as it "seems" right based on the music in Galaga
CPU is a Z8S18020VSC (20MHz part)
OSC is 73.728MHz (is the clock divide 3 or 4?)
* Is the clock divide 3 or 4?
***************************************************************************/
@ -43,6 +40,18 @@
/*************************************
*
* Clocks
*
*************************************/
#define MASTER_CLOCK (XTAL_73_728MHz)
#define MAIN_CPU_CLOCK (MASTER_CLOCK / 4) /* divider is either 3 or 4 */
#define NAMCO_AUDIO_CLOCK (MASTER_CLOCK / 4 / 6 / 32)
/*************************************
*
* Interrupt system
@ -280,7 +289,7 @@ static MACHINE_DRIVER_START( 20pacgal )
MDRV_DRIVER_DATA(_20pacgal_state)
/* basic machine hardware */
MDRV_CPU_ADD(Z180,20000000) /* 20MHz ??? Needs to be verified! */
MDRV_CPU_ADD(Z180, MAIN_CPU_CLOCK)
MDRV_CPU_PROGRAM_MAP(20pacgal_map,0)
MDRV_CPU_IO_MAP(20pacgal_io_map,0)
MDRV_CPU_VBLANK_INT(irq0_line_assert,1)
@ -293,7 +302,7 @@ static MACHINE_DRIVER_START( 20pacgal )
/* sound hardware */
MDRV_SPEAKER_STANDARD_MONO("mono")
MDRV_SOUND_ADD(NAMCO, 18432000/6/32)
MDRV_SOUND_ADD(NAMCO, NAMCO_AUDIO_CLOCK)
MDRV_SOUND_CONFIG(namco_interface)
MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)