Added new file xtal.h with commonly known/used clock XTALs.

Added #include "drivers/xtal.h" to driver.h so that these values are always available.

.gitattributes

@@ -500,6 +500,7 @@ src/emu/drawgfx.h svneol=native#text/plain
 src/emu/driver.c svneol=native#text/plain
 src/emu/driver.h svneol=native#text/plain
 src/emu/drivers/empty.c svneol=native#text/plain
+src/emu/drivers/xtal.h svneol=native#text/plain
 src/emu/eigccppc.h svneol=native#text/plain
 src/emu/eigccx86.h svneol=native#text/plain
 src/emu/eminline.h svneol=native#text/plain

src/emu/driver.h

@@ -68,6 +68,7 @@
 #include "output.h"
 #include "tilemap.h"
 #include "romload.h"
+#include "drivers/xtal.h"
 #include "machine/generic.h"
 #include "audio/generic.h"
 #include "video/generic.h"

src/emu/drivers/xtal.h

@@ -0,0 +1,119 @@
+/*************************************************************************
+
+    xtal.h
+
+    Documentation and consistent naming for known existing crystals. 
+
+    Copyright (c) 1996-2007, Nicola Salmoria and the MAME Team.
+    Visit http://mamedev.org for licensing and usage restrictions.
+
+***************************************************************************
+
+	PCB Crystal Reference
+	----------------------
+	   _____     ________
+	   |16 |    |o       |
+	   |MHZ|    |16.0MHZ |
+	   |___|    |________|
+	   |   |
+
+	There is a finite list of _manufactured_ crystals. This file aims
+	to document all of the known speeds that crystals were available in.
+	Feel free to add to the list if you find another speed crystal on
+	a PCB, but please DON'T GUESS!
+	
+	Remember that some very high frequencies (typically above 100MHz) are 
+	generated by a frequency multiplying IC from a lower frequency 
+	crystal. 
+	
+	This is intended as a reference of existing parts to prevent incorrect 
+	clock speed measurements with digital frequency counters being used 
+	in drivers. When measuring clocks, remember that most parts have a 
+	tolerance so be sure to reference existing parts only and not just 
+	accept direct readings as 100% true.
+	
+	(Thanks to Guru for starting this documentation.)
+
+**************************************************************************/
+
+enum
+{
+/*
+	Name				= Frequency		Examples
+    ------------------    ------------  ------------------------------------------------------------ */
+	XTAL_32_768kHz		= 327680,		/* 32.768kHz, used to drive RTC chips */
+	XTAL_1MHz    		= 1000000,
+	XTAL_2MHz    		= 2000000,
+	XTAL_3MHz    		= 3000000,		/* Probably only used to drive 68705 or similar MCUs on 80's Taito PCBs */
+	XTAL_3_579545MHz   	= 3579545,
+	XTAL_3_6864MHz  	= 3686400,		/* CPS3 */
+	XTAL_4MHz    		= 4000000,
+	XTAL_4_224MHz   	= 4224000,		/* Used to drive OKI M6295 chips, usually with /4 divider */
+	XTAL_4_9152MHz   	= 4915200,
+	XTAL_6MHz    		= 6000000,
+	XTAL_7_3728MHz   	= 7372800,
+	XTAL_8MHz    		= 8000000,
+	XTAL_10MHz   		= 10000000,
+	XTAL_10_595MHz  	= 10595000,		/* Mad Alien */
+	XTAL_11_289MHz  	= 11289000,		/* Vanguard */
+	XTAL_12MHz   		= 12000000,
+	XTAL_12_288MHz  	= 12288000,		/* Sega Model 3 digital audio board */
+	XTAL_13_3MHz  		= 13300000,		/* BMC bowling */
+	XTAL_13_33056MHz 	= 13330560,		/* Taito L */
+	XTAL_14MHz   		= 14000000,
+	XTAL_14_31818MHz  	= 14318180,
+	XTAL_14_705882MHz  	= 14705882,		/* Aleck64 */
+	XTAL_14_7456MHz 	= 14745600,		/* Namco System 12 & System Super 22/23 for H8/3002 CPU */
+	XTAL_15_468MHz  	= 15468000,		/* Bank Panic h/w, Sega G80 */
+	XTAL_16MHz   		= 16000000,
+	XTAL_16_9344MHz  	= 16934400,		/* Usually used to drive 90's Yamaha OPL/FM chips */
+	XTAL_18MHz   		= 18000000,
+	XTAL_18_432MHz  	= 18432000,
+	XTAL_19_968MHz  	= 19968000,		/* Used mostly by Space Invaders games by Taito/Midway and clones */
+	XTAL_20MHz   		= 20000000,
+	XTAL_21_3MHz  		= 21300000,
+	XTAL_21_4772MHz 	= 21477200,		/* BMC bowling */
+	XTAL_22MHz   		= 22000000,
+	XTAL_24MHz   		= 24000000,
+	XTAL_24_576MHz  	= 24576000,		/* Pole Position h/w, Model 3 CPU board */
+	XTAL_25MHz   		= 25000000,		/* Namco System 22, Taito GNET */
+	XTAL_25_1748MHz  	= 25174800,		/* Sega S16A, S16B */
+	XTAL_26_66666MHz 	= 26666660,		/* Irem M92 but most use 27MHz */
+	XTAL_26_686MHz 		= 26686000,		/* Typically used on 90's Taito PCBs to drive the custom chips */
+	XTAL_27MHz   		= 27000000,		/* Some Banpresto games macrossp and Irem M92 */
+	XTAL_27_164MHz  	= 27164000,		/* Typically used on 90's Taito PCBs to drive the custom chips */
+	XTAL_28MHz   		= 28000000,
+	XTAL_28_63636MHz  	= 28636360,		/* later Leland games and Atari GT */
+	XTAL_30_4761MHz  	= 30476100,		/* Taito JC */
+	XTAL_32MHz   		= 32000000,
+	XTAL_32_22MHz  		= 32220000,		/* Typically used on 90's Data East PCBs */
+	XTAL_32_5304MHz  	= 32530400,		/* Seta 2 */
+	XTAL_33MHz   		= 33000000,		/* Sega Model 3 video board */
+	XTAL_33_333MHz  	= 33333000,		/* Sega Model 3 CPU board, Vegas */
+	XTAL_33_8688MHz  	= 33868800,		/* Usually used to drive 90's Yamaha OPL/FM chips with /2 divider */
+	XTAL_36MHz   		= 36000000,		/* Sega Model 1 video board */
+	XTAL_38_76922MHz  	= 38769220,		/* Namco System 21 video board */
+	XTAL_40MHz   		= 40000000,
+	XTAL_42_9545MHz  	= 42954500,		/* CPS3 */
+	XTAL_45MHz   		= 45000000,		/* Eolith with Hyperstone CPUs */
+	XTAL_45_158MHz  	= 45158000,		/* Sega Model 2A video board, Model 3 CPU board */
+	XTAL_48MHz   		= 48000000,
+	XTAL_49_152MHz  	= 49152000,		/* Used on some Namco PCBs, Baraduke h/w, System 21, Super System 22  */
+	XTAL_50MHz   		= 50000000,
+	XTAL_52MHz   		= 52000000,		/* Cojag */
+	XTAL_53_693175MHz  	= 53693175,		/* PSX-based h/w, Sony ZN1-2-based */
+	XTAL_54MHz   		= 54000000,		/* Taito JC */
+	XTAL_57_2727MHz  	= 57272700,		/* Psikyo SH2 with /2 divider */
+	XTAL_60MHz   		= 60000000,
+	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_100MHz  		= 100000000,	/* PSX-based Namco System 12, Vegas, Sony ZN1-2-based */
+	XTAL_101_4912MHz  	= 101491200,	/* PSX-based Namco System 10 */
+
+/* Resonators (There are probably more. Almost always used for driving OKI sound chips) */
+
+	XTAL_384kHz			= 384000,
+	XTAL_640kHz			= 640000
+};