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-rw-r--r--src/emu/drivers/xtal.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/emu/drivers/xtal.h b/src/emu/drivers/xtal.h
index 760457c68a3..8331f38ec52 100644
--- a/src/emu/drivers/xtal.h
+++ b/src/emu/drivers/xtal.h
@@ -188,7 +188,7 @@ enum
XTAL_24_576MHz = 24576000, /* Pole Position h/w, Model 3 CPU board */
XTAL_24_8832MHz = 24883200, /* DEC VT100 */
XTAL_25MHz = 25000000, /* Namco System 22, Taito GNET, Dogyuun h/w */
- XTAL_25_1748MHz = 25174800, /* Sega S16A, S16B */
+ XTAL_25_1748MHz = 25174800, /* Sega System 16A/16B (1600x NTSC line rate) */
XTAL_25_39836MHz = 25398360, /* Tandberg TDV 2324 */
XTAL_25_447MHz = 25447000, /* Namco EVA3A (Funcube2) */
XTAL_25_590906MHz = 25590906, /* Atari Jaguar NTSC */
@@ -233,6 +233,7 @@ enum
XTAL_49_152MHz = 49152000, /* Used on some Namco PCBs, Baraduke h/w, System 21, Super System 22 */
XTAL_50MHz = 50000000, /* Williams/Midway T/W/V-unit system */
XTAL_50_113MHz = 50113000, /* Namco NA-1 (14x NTSC subcarrier)*/
+ XTAL_50_3496MHz = 50349600, /* Sega System 18 (3200x NTSC line rate) */
XTAL_52MHz = 52000000, /* Cojag */
XTAL_52_832MHz = 52832000, /* Wang PC TIG video controller */
XTAL_53_693175MHz = 53693175, /* PSX-based h/w, Sony ZN1-2-based (15x NTSC subcarrier) */