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-rw-r--r--src/emu/xtal.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/emu/xtal.cpp b/src/emu/xtal.cpp
index fa863b35413..9085b10b869 100644
--- a/src/emu/xtal.cpp
+++ b/src/emu/xtal.cpp
@@ -63,6 +63,7 @@ const double XTAL::known_xtals[] = {
400'000, /* 400_kHz_XTAL Resonator - OKI MSM5205 on Great Swordman h/w */
430'000, /* 430_kHz_XTAL Resonator */
455'000, /* 455_kHz_XTAL Resonator - OKI MSM5205 on Gladiator h/w */
+ 500'000, /* 500_kHz_XTAL Resonator - MIDI clock on various synthesizers (31250 * 16) */
512'000, /* 512_kHz_XTAL Resonator - Toshiba TC8830F */
600'000, /* 600_kHz_XTAL - */
640'000, /* 640_kHz_XTAL Resonator - NEC UPD7759, Texas Instruments Speech Chips @ 8khz */